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Da Pan, Boyang Shi, Hongying Sun
Published: 1 October 2021
Crustaceana, Volume 94, pp 1059-1070; https://doi.org/10.1163/15685403-bja10141

Abstract:
A new species of freshwater crab of the genus Teretamon Yeo & Ng, 2007, Teretamon husicum sp. nov., is described here from Husa Town, Longchuan County, Dehong Prefecture, Yunnan Province, China. Teretamon husicum sp. nov. can be distinguished from other species by a suite of morphological characters, including a bilobed frontal margin, smooth posterolateral regions, and a broadly rounded dorsal flap on the G1 terminal segment. An updated identification key for the species of the genus Teretamon is provided.
Xilei Li, Tiantian Chen, Ruihan Xu, Qiming Xie, Shiping Su, Keyi Ma, Rufang Ma
Published: 1 October 2021
Crustaceana, Volume 94, pp 1085-1101; https://doi.org/10.1163/15685403-bja10137

Abstract:
In crustaceans, methyl farnesoate (MF) is an important sesquiterpenoid to regulate many physiological processes, especially reproduction and ovarian maturation. In this study, a 1919 bp cDNA of carboxylesterases (Es-CXE6) with some conserved motifs of the CXE multifunctional enzyme family was cloned from Eriocheir sinensis. Tissue and stage-specific expression results suggested that Es-CXE6 expression in hepatopancreas was highest and associated with the haemolymph MF titer. In vitro and in vivo experiments showed that Es-CXE6 expression was significantly upregulated by MF treatment in the hepatopancreas but not in the ovary. Furthermore, an eyestalk ablation experiment showed that Es-CXE6 expression was significantly upregulated on days 1 and 3 post eyestalk ablation in the hepatopancreas. Together, these results indicate that Es-CXE6 may degrade MF in the hepatopancreas in E. sinensis. Our results offer a potential approach to maintain the MF titer at appropriate levels, which has potential applications in crab aquaculture.
Mulyadi
Published: 1 October 2021
Crustaceana, Volume 94, pp 1121-1136; https://doi.org/10.1163/15685403-bja10157

Abstract:
Two new species of Pontella from Indonesian waters are herein described. Pontella nishidai n. sp. is distinguishable in the female by the posterior corners of its Pdg5 being pointed, the left side of Ur1 with a dorsolateral semi-circular process, and the form of the P5; in the male by the Ur1 naked, the bifurcated thumb of the chela and the very slender shape of the finger of the right P5. Pontella gilimanukensis n. sp. is distinguishable in the female by having a large beak-like process of Ur1, and the asymmetrical CR; in the male by the short posterior corners of Pdg5 and the form of the P5.
Guofeng Zhou, Wangang Zhang, Kaichin Wong, Jianrong Huang
Published: 1 October 2021
Crustaceana, Volume 94, pp 1103-1119; https://doi.org/10.1163/15685403-bja10146

Abstract:
In this study, four species of atyid shrimps of the genus Caridina, viz., Caridina cantonensis Yü, 1938, C. breviata N. K. Ng & Cai, 2000, C. gracilipes De Man, 1892 and C. macauensis sp. nov., are documented from Macau, China for the first time. The new species, C. macauensis sp. nov., is identified using morphological and molecular data. According to its morphology, C. macauensis is distinguished from the closely related species C. trifasciata Yam & Cai, 2003, by a shorter rostrum, male second pereiopod and colouration. A diagnosis of the three known species and a full description of C. macauensis sp. nov. are presented. Furthermore, genetic data of C. macauensis sp. nov. derived from the mitochondrial cytochrome c oxidase subunit I (COI) support that this species has a sufficient interspecific divergence from its congeners.
Kunihiko Izawa
Published: 1 October 2021
Crustaceana, Volume 94, pp 1137-1144; https://doi.org/10.1163/15685403-bja10142

Abstract:
Naricolax holinorum sp. nov. is described based on specimens of both sexes recovered from the nasal cavity of Acanthopagrus schlegelii (Bleeker, 1854) (Pisces, Sparidae) in Japan. This species was erroneously redescribed first as N. atypicus Ho, Do & Kasahara, 1983 by Ho & Lin (2005) based on specimens of the female collected from the nasal cavity of A. schlegelii in Taiwan.
C. Nahxieli Reyes-González,
Published: 1 October 2021
Crustaceana, Volume 94, pp 1071-1084; https://doi.org/10.1163/15685403-bja10147

Abstract:
A new species of the diverse and widely distributed symbiotic copepod genus Asterocheres is described from the sea star Nidorellia armata (Gray, 1840) in Mexican waters of the Eastern Tropical Pacific. The new species resembles various other congeners by sharing several characters including: (1) a siphon extending to the intersection of the maxilliped, (2) a 21-segmented antennule, and (3) a 2-segmented mandible palp. It can be distinguished by the unique structure and ornamentation of the maxilla, the armature and proportions of the fifth leg, and its body shape. This is the first documented record of Asterocheres from the Mexican Pacific and the first finding of a symbiotic copepod on this sea star host. Males, ovigerous females and copepodites were recorded from the host, thus suggesting a well-established symbiotic association. It is likely that copepods feed on the host’s tegument. Further studies will be needed to assess the reproductive traits and seasonality of this copepod as a symbiont.
, Joseph Bayi, Vanessa Ngo-Massou, Ndongo Din, Angela Sacchi, ,
Published: 1 October 2021
Crustaceana, Volume 94, pp 1043-1058; https://doi.org/10.1163/15685403-bja10148

Abstract:
The mangrove forests surrounding Douala, Cameroon, have a long history of human impact due to rapid urbanization, resulting in patches of true mangrove forest interspersed with areas dominated by the mangrove-associated Pandanus species. A survey carried out to assess the possible shift in crab fauna composition and dominance between mangrove and Pandanus dominated areas revealed an undescribed phytotelmic habitat for Platychirarma buettikoferi. This species was found colonizing the natural reservoirs of fresh water represented by Pandanus spp. Our results show P. buettikoferi to be ecologically dependent upon Pandanus spp., and absent on the mangrove floor and trees, strongly indicating a phytotelmic adaptation. Our data suggest that this species is a facultative phytotelmic species well adapted to Pandanus spp. dominated areas. Further studies on the reproductive biology and feeding behaviour of P. buettikoferi may shed light on this unique phytotelmic lifestyle and its role in mangrove ecosystem functioning.
Ibrahim Gaber, Oleg Latyshev
Published: 10 September 2021
Crustaceana, Volume 94, pp 903-932; https://doi.org/10.1163/15685403-bja10120

Abstract:
This study searches to provide appropriate conditions to trigger spawning in Penaeus semisulcatus in aquaculture. The aim was to test the effect of 17β-oestradiol and 17α-hydroxyprogesterone on ovarian maturation and to study the correlation between the different stages of ovarian maturation and hormonal levels in the ovaries, hepatopancreas, and haemolymph. Female shrimps were collected from Ras El-Tin beach and the fishing port to Abu Qir Bay of the Mediterranean Sea off Alexandria, Egypt from June 2018-August 2019. Shrimps were individually weighed and subsequently killed by thermal shock at a maximum temperature of 45°C. Gonadosomatic and hepatosomatic indices were calculated. The correlation between the gonadosomatic and hepatosomatic indices indicates the presence of endogenous and exogenous vitellogenesis. The haemolymph, hepatopancreas, and ovaries were studied by stereo- and electron microscopy. From 15 females in each season the mentioned tissues were isolated for the extraction and quantification of steroid hormones during the different stages of gonadal maturation using radioimmunoassay. An ecdysteroid- and steroid-extraction protocol was applied. Aliquots were collected from the haemolymph to identify 17β-oestradiol and 17α-hydroxyprogesterone by mass spectrometry. Five stages of gonadal maturation were observed. The hepatopancreas was formed by a set of tubules lined with pseudostratified epithelium composed of five cell types, cell E (undifferentiated), cell F (fibrillar), cell B (vesicular), R (reabsorbing), and M (basal) cells. Steroidogenic tissues were small in size and numerous. The ultrastructure of the ovary and hepatopancreas were studied during oocyte development. There was a high concentration of 17β-oestradiol and 17α-hydroxyprogesterone in stages I and II of ovarian maturation, coinciding with the preparation phase for vitellogenesis. A progressive decrease of these steroid hormones occurred during the course of gonadal maturation, and reached its lowest concentration in the spawning period. The ecdysone concentration did not fluctuate in ripe females. Its level increases from stages I-IV of vitellogenesis onward.
Reinaldo Rivera, Javier Pinochet, Patricio De Los Ríos-Escalante,
Published: 10 September 2021
Crustaceana, Volume 94, pp 933-950; https://doi.org/10.1163/15685403-bja10134

Abstract:
The pattern of species richness and its potential causes are fundamental knowledge for an adequate management of biodiversity. In the present study, based on georeferenced lacustrine zooplankton, we evaluated the general species richness pattern and its relationship with hydrographic zonation, assessing four hypotheses: (1) the Rapoport latitudinal effect; (2) geometric restrictions as hard limits to geographical dispersion; (3) nestedness as a measure of the historical dynamics of extinction-colonization; and (4) environmental variables, as a measurement of the habitat as a recent ecological factor. Our results show a heterogeneous species richness pattern, with maxima located between 32-34°S, showing a general decrease towards higher latitudes. However, this pattern does not relate to the Rapoport latitudinal effect or the geometric restrictions. Instead, the pattern is associated with historical extinction-colonization dynamics between the waterbodies and ecological factors such as landscape, water, and energy availability that determine the number of species that these waterbodies can currently support.
Cuiying Chen, Xiaofeng Nie, Yu Cheng, Jiajian Shen, Xianda He, Shuqi Wang, Cuihong You, Yuanyou Li
Published: 10 September 2021
Crustaceana, Volume 94, pp 1021-1033; https://doi.org/10.1163/15685403-bja10153

Abstract:
This study was carried out to analyse the growth performance, feed utilization, and antioxidant capacity of juvenile mud crab (Scylla paramamosain) reared in two conditions. Here, a new indoor polypropylene tank culture system and a traditional outdoor pond cage facility were used to perform feeding experiments on juvenile crabs. After eight weeks, the survival rate, weight gain, moulting rate and feed efficiency of crabs cultured in polypropylene tanks were markedly higher than those cultured in pond cages. Moreover, the activities of serum acid phosphatase (ACP) and alkaline phosphatase (ALP), and the antioxidant indices including glutathione peroxidase (GSH-PX), glutathione transferase (GST), superoxide dismutase (SOD) and total antioxidant capacity (T-AOC) in hepatopancreas were higher in crabs cultured in the polypropylene tank system than those in pond cages. Based on these results, compared with the traditional pond cages, the polypropylene tank culture system is more suitable for the short-term culture of mud crabs.
H. P. Wagner, C. Bou
Published: 10 September 2021
Crustaceana, Volume 94, pp 993-1019; https://doi.org/10.1163/15685403-bja10145

Abstract:
Two new species of Thermosbaenacea are described from various locations in southern France. One species is Limnosbaena occidentalis n. sp., a species that has been known since 1967 and has long been awaiting a formal description, the other is Tethysbaena exigua n. sp., a very small species that represents a new species-group within the genus and has more morphological affinities with the Caribbean Tethysbaena sanctaecrucis species-group than with any other group. Furthermore, some considerations about the origin and ecology of these species are given. Three species distributed over the families of Halosbaenidae and Monodellidae are now known in France within a radius of 80 km around Marseille, one of which has also been identified in the alluvial aquifer of the Dordogne river.
Tomislav Karanovic
Published: 10 September 2021
Crustaceana, Volume 94, pp 951-972; https://doi.org/10.1163/15685403-bja10136

Abstract:
The genus Itunella Brady, 1896 has a troubled taxonomic past, partly because of paucity of its members, but mostly because of inadequate research. A lack of detail in species descriptions and redescriptions, absence of alternative methods for testing species hypotheses, combined with a notion that most marine and estuarine animals have wide distributions and enormous intraspecific variability, all resulted in blurring of some interspecific boundaries, synonymizing without examination of the type material, and founding species diagnoses on dubious characters. Itunella yeondeokensis sp. nov. is described here in great detail from a small sandy beach on the east coast of Korea. It differs from all reported and illustrated congeners by an extremely long inner apical seta on the third exopodal segment of second to fourth swimming legs. This is the second member of this genus from Korea, the first one being described from three estuaries also on the east coast. All other congeners are European species. An overview of all published species and records of this genus is provided, as well as a dichotomous key to valid species to aid in their identification. Itunella kieferi sp. nov. is a new name for a single female from Germany, previously reported as a member of a widely distributed and polymorphic species.
Published: 10 September 2021
Crustaceana, Volume 94, pp 981-992; https://doi.org/10.1163/15685403-bja10135

Abstract:
In the present study, weight-at-age data of reared Pacific white shrimp, Penaeus vannamei Boone, 1931, were analysed under four different assumptions of variance (observed, constant, depensatory, and compensatory variance) in order to analyse the robustness for selecting the right standard deviation structure to parametrize the Von Bertalanffy, Logistic and Gompertz models. Selection of the best model and variance criteria were obtained based on the Bayesian information criterion (BIC). According to the results of the BIC, the observed variance in the present study proved to constitute the best way to parametrize the three above-listed growth models, and the Von Bertalanffy model appeared to be the best to represent the growth curve found. This is an asymptotic sigmoid curve with an inflection point. Based on these results, using the observed error structure to calculate the growth parameters in multi-model inference analyses is recommended.
Kunihiko Izawa
Published: 10 September 2021
Crustaceana, Volume 94, pp 973-980; https://doi.org/10.1163/15685403-bja10138

Abstract:
As in the original description of Naricolax sphyraenae Izawa, 2020, copepodid IV female of the species was described based on a wrong judgement of the sex, the species is redescribed and both sexes of copepodid IV of the species are correctively described, while additionally copepodid V male of the species is described for the first time, based on specimens newly collected from the original host, Sphyraena pinguis Günther, 1874 (Pisces, Sphyraenidae) from Japan.
Rachata Maneein, , Jirarach Kitana, Noppadon Kitana
Published: 31 August 2021
Crustaceana, Volume 94, pp 823-844; https://doi.org/10.1163/15685403-bja10130

Abstract:
The rice field crab is considered a pest that disrupts rice production in paddy fields in tropical regions. The crab is also used as a stable food source by local people in many countries in Southeast Asia. For both of these roles, a good knowledge of the crab’s reproductive biology is necessary to manage populations in their natural habitats. This study aims to investigate the reproductive cycle of adult males of the rice field crab Esanthelphusa nani (Naiyanetr, 1984). Males crabs were sampled monthly in a paddy field; individuals were then anaesthetized and dissected, and their reproductive tract was analysed. The gonadosomatic index (GSI) was evaluated based on the relative weight of the reproductive tract and body weight. The male GSI showed significant temporal difference, with the highest levels in June, August and September. Based on GSI and macroscopic examination, the testis and vas deferens can be classified into three stages of increasing size: (1) resting stage, (2) developing stage and (3) active stage. Microscopic examination revealed that the testis and vas deferens had a tubular structure. Seminiferous tubules in the testis underwent spermatogenesis and spermiogenesis at every stage. The vas deferens consisted of three major regions: anterior, middle and posterior, which showed different types of epithelia. Interestingly, the microscopic structure of the vas deferens was similar among these three reproductive stages. It is also important to note that round-shaped spermatozoa were found in different parts of the reproductive tract, including the seminiferous tubule and vas deferens, as well as in the female seminal receptacle, whereas no spermatophores were found in this species. Overall, this study shows that mature sperms can be found in the reproductive tract of male E. nani throughout the year, indicating that males have prolonged spermatogenic activities.
, Abdallah Al-Mahasneh
Published: 31 August 2021
Crustaceana, Volume 94, pp 811-822; https://doi.org/10.1163/15685403-bja10107

Abstract:
This article uses the male spider crab Lissa chiragra, collected from Ras el Tin beach on the Mediterranean Sea at Alexandria, Egypt between January and December 2017, as a model to isolate the histone variants, H2A, H2B, H3 and H4 from spermatozoal nuclei to detect the presence of their genes and the chromatin-associated proteins. The spermatozoal chromatin in Brachyura is electron dense. During spermiogenesis somatic histones and sperm nuclear basic proteins (SNBP’s) are replaced partially or totally by protamines or keratin proteins, which are rich in arginine and oxidized cysteine. Histones, which are part of the nucleosome, are classified according to their functional and structural criteria into H2A, H2B, H3 and H4. Amino acids of the purified chromatin associated proteins are analysed with high resolution liquid chromatography. The low condensation of the nucleus of the spermatozoa is due to a low proportion and modification of the chromatin-associated histones. The DNA is organized into nucleosomes but not in higher order structures due to acetylation of histone H4, but rather via regions of histone-free DNA.
Kunihiko Izawa
Published: 31 August 2021
Crustaceana, Volume 94, pp 845-853; https://doi.org/10.1163/15685403-bja10129

Abstract:
Megacolax gen. nov. (Copepoda, Cyclopoida, Bomolochidae) is established to accommodate Naricolax insolitus Ho & Lin, 2003, and next Megacolax insolitus (Ho & Lin, 2003) emended is redescribed based on specimens of both sexes recovered from the nasal cavity of the original host, Pampus argenteus (Euphrasen, 1788) (Pisces, Stromateidae) in Japan. The male is described for the first time for the species.
Alfred-Ştefan Cicort-Lucaciu, Gabriel-Lucian Herlo
Published: 31 August 2021
Crustaceana, Volume 94, pp 775-795; https://doi.org/10.1163/15685403-bja10131

Abstract:
In the last two hundred years, the Mureş River Floodplain has suffered major changes caused by dike constructions, meander cutting, and by the transformation of the natural landscape into an agricultural one. In this environmental context, we wanted to find out the degree to which large branchiopod species still survive in the Mureş Floodplain area. Every stagnant aquatic habitat encountered in 2019 in the Mureş Floodplain Natural Park was sampled. For the habitats where more species co-occur, urgent preservation actions must be taken. Most of the species prefer open habitats and have survived in the wheel ruts on agricultural lands. In the absence of natural habitats, the importance of this habitat type becomes a major one. The forest advantages species related to shady habitats, such as Chirocephalus diaphanus. We have found several individuals in the park that showed black spots on their bodies, characteristic of the black disease of fairy shrimp. The presence of the disease only in the populations from wheel ruts suggests that vehicles which make these ruts, could be the carriers of the disease.
Ming Zhao, Fengying Zhang, Wei Wang, Zhiqiang Liu, Lingbo Ma
Published: 31 August 2021
Crustaceana, Volume 94, pp 855-863; https://doi.org/10.1163/15685403-bja10133

Abstract:
The mud crab Scylla paramamosain is one of the economically important aquaculture species in China. The larval development of the mud crab is characterized by two significant morphological changes, from the 5th zoea (Z5) to the megalopa (M) stage and from the M to the first juvenile crab (C1) stage. In this study, we found that methyl farnesoate (MF) could prohibit the Z5 to M metamorphosis in a concentration-dependent manner, and that a concentration of 10 μM MF could completely prohibit the Z5 metamorphosis. Farnesoic acid (FA) could also prohibit the Z5 metamorphosis, but its effects seemed to be concentration-independent. In addition, MF could delay rather than prohibit the M to C1 metamorphosis, while FA had no effect on the M to C1 metamorphosis at all. To summarize, it is hypothesized that either absence of MF and FA, or at least very low levels of these substances, might be necessary for a successful Z5 to M metamorphosis.
Patricio De Los Ríos-Escalante, Jaime Pizarro-Araya, Fermín M. Alfaro, Jorge Perez-Schultheiss
Published: 3 May 2021
Crustaceana, Volume 94, pp 519-528; https://doi.org/10.1163/15685403-bja10097

Abstract:
The terrestrial isopods of Chile make a group on which until now only a few studies have been done, most of which based mainly on species records in isolated zones. The aim of the present study was to make an attempt at characterization of the isopods present in three coastal protected areas in the Atacama Desert and northern-central Chile, and compare the results with literature records for northern and central Chile. The collected specimens belong to the genus Benthanoides (Oniscoidea, Philosciidae), probably to the species Benthanoides pauper that was originally described for central Chile. The obtained results would not agree with literature records that described the presence of two species of the genus Tylos (Oniscoidea, Tylidae) between 26-29°S, and it would be the first isopod genus recorded north of 26°S (Paposo priority site, Antofagasta Region). More systematic and ecological studies would be necessary for understanding the geographical distribution of Chilean terrestrial isopods.
Gilberto G. Ortega-Lizárraga, Raúl Pérez-González, Guillermo Rodríguez-Domínguez, E. Alberto Aragón-Noriega, Jaime E. Mendivil-Mendoza, Jesús A. Franco-Ruíz
Published: 3 May 2021
Crustaceana, Volume 94, pp 573-596; https://doi.org/10.1163/15685403-bja10110

Abstract:
The spot prawn fishery, targeting Pandalus platyceros, has failed to prove commercially viable on the Mexican Pacific coast. A survey was carried out off the northwestern coast of Baja California, at depths of 140-180 m. The objective was to describe the biological traits of the species to test the hypothesis that warmer water stimulates higher growth parameters. An average model was estimated that anticipated an inverted exponential growth curve, consequently the growth parameters of the Von Bertalanffy model were obtained as , carapace length (CL) and . Being a protandric hermaphrodite, the transition size was estimated at 40.8 mm CL. The results challenged the hypothesis that P. platyceros grows faster in temperate environments than in cold environments.
Jin Ah Song, Kang Hee Kho, Young-Su Park, Ji Yong Choi, Cheol Young Choi
Published: 3 May 2021
Crustaceana, Volume 94, pp 551-571; https://doi.org/10.1163/15685403-bja10111

Abstract:
Female cleaner shrimps Lysmata amboinensis either underwent eyestalk ablations (EA), or were treated with two different wavelength intensities of red light (peak at 630 nm), and then their sex maturation and the effects on their egg quality parameters were compared. Vitellogenesis-inhibiting hormone (VIH), vitellogenin (VTG), VTG-receptor (VTG-R), and crustacean hyperglycemic hormone (CHH) expressions in the hepatopancreas were analysed. VTG-R expression (in situ) levels that caused the EA and red irradiation to induce the synthesis of VTG-R were assessed, and the triglycerides (TG) and glucose levels in the eggs were analysed. VIH expression was decreased in all experimental groups, but VTG and VTG-R expressions were increased. CHH expression and TG and glucose concentrations were higher in the red irradiation group, compared to the EA group. These results confirmed that the red light not only had a positive effect on the promotion of sex maturation, but it also improved the quality of the eggs, when compared to the EA method.
Raúl Cruz, Carlos A. Borda, João V. M. Santana, Carlos G. Barreto, Bárbara P. Paiva, Juliana C. Gaeta, Marina T. Torres, Jessica L. S. Da Silva, Israel H. A. Cintra
Published: 3 May 2021
Crustaceana, Volume 94, pp 603-645; https://doi.org/10.1163/15685403-bja10116

Abstract:
In this study, we look at recent developments in our understanding of the life cycle of the red spiny lobster Panulirus argus (Latreille, 1804) and examine the evidence for connectivity between geographical regions, especially the north-northeast Brazilian continental shelf and the Wider Caribbean. The study also covers aspects of reproduction, phyllosoma density, large-scale oceanic circulation, self-recruitment, settlement patterns, ecological behaviour, and the impact of the Amazon and Orinoco river discharge on recruitment. Our findings support the hypothesis that lobster larvae are transported by ocean currents and free eddies from Brazil to the Caribbean via the Lesser Antilles, outlining a south-to-north connectivity. In addition, we look into the probable existence of hybrids between sympatric lobster species, as evidenced by differences in colour patterns and morphology.
Jure Jugovic, Martina Jeklar
Published: 3 May 2021
Crustaceana, Volume 94, pp 529-549; https://doi.org/10.1163/15685403-bja10075

Abstract:
We investigated the presence and ecology of Chirocephalus croaticus (Steuer, 1899) during three successive seasons (spring and autumn 2018, spring 2019) at Lake Petelinje (SW Slovenia). Although the presence (duration, abundance) of this fairy shrimp strongly differs among different seasons and both years, we showed that in a season with favourable conditions (spring 2018) its abundance increases rapidly at the end of the season as the shrimps persist in small pools until the water dries out. The species may appear again during the autumn, however, its abundance and persistence seem to be much lower and shorter than during the spring, respectively. Nevertheless, persistence and abundance may also differ strongly among the two successive spring seasons (less shrimps found during the shorter season of 2019 than in 2018). Larvae appear first, and are most abundant at the beginning of the season, and are followed by adult males (protandry) and females, which become most abundant at the end of the season. Also, larvae seem to be more abundant on exposed bottom (gravel path), while adults are much more abundant in the shelter of a submerged meadow. Ovigerous females had 9-37 cysts (fertilized eggs) in their brood pouch, and the position of differently developed eggs changed during the season; the presence of females without eggs during mid- and at the end of season indicates the production of thin-shelled summer, and thick-shelled winter cysts, respectively. In contrast with the water decrease that is in strongly negative association with the abundance of the fairy shrimps (lake size — abundance: , ), no other environmental parameters were highly associated () with species abundance. Although the local population (one of only two currently known) seems to be in good condition, appropriate conservation action should be taken to prevent the decrease of this population in the future.
Kunihiko Izawa
Published: 3 May 2021
Crustaceana, Volume 94, pp 597-601; https://doi.org/10.1163/15685403-bja10102

Abstract:
The male of an unknown species of Pennellidae is described based on a single specimen parasitic on the branchial lamellae of the limpid-wing flyingfish Cheilopogon unicolor (Valenciennes, 1847) (Pisces, Exocoetidae). The male has a 1-segmented abdomen and biramous legs 1 and 2, as well as uniramous legs 3 and 4; the rami of all legs are 2-segmented.
Chun-Yang Shen, Chunwei Liu, Xiao-Fang Wu, Liping Yao, Xinyu Meng, Lidong Xia, Wang Pei-Zheng, Weidong Li, Amin Eimanifar, Alireza Asem
Published: 3 May 2021
Crustaceana, Volume 94, pp 647-650; https://doi.org/10.1163/15685403-bja10113

Kwee Siong Tew, Hsin-Ling Chen, Chiao-Chuan Han
Published: 13 April 2021
Crustaceana, Volume 94, pp 431-446; https://doi.org/10.1163/15685403-bja10108

Abstract:
Previous studies have revealed that reproductive traits of the Oriental river prawn Macrobrachium nipponense (De Haan, 1849) (Palaemonidae) can differ markedly across populations, though the environmental factors responsible for such variation are unknown. We therefore conducted monthly surveys of these prawns to determine their reproductive traits over two years at four study sites in southern Taiwan. The temperature, dissolved oxygen concentration, conductivity, and turbidity in Long Luan Lake significantly differed from the other sites, yet levels of reproductive trait parameters were intermediate among all. The aforementioned environmental factors were similar between the two Sihchong River sites and Mudan Reservoir, yet the river populations had the highest values in all reproductive traits. The river’s substratum was comprised of >60% of cobbles and boulders, whereas <5% of the substratum of the reservoir and lake consisted of such rocks. We therefore suggest that this difference in substrate composition may be linked to the significant differences in reproductive traits observed.
Ye Ji Lee, Won Gyu Park
Published: 13 April 2021
Crustaceana, Volume 94, pp 413-429; https://doi.org/10.1163/15685403-bja10105

Abstract:
The population dynamics of Stenothoe valida Dana, 1852 were studied at Cheongsapo beach of Busan, Republic of Korea, from March 2019 to March 2020. Sampling was conducted once a month at low tide during spring tides. Specimens were grouped by the cephalic length at 0.025 mm intervals, and classified into four categories: females, ovigerous females, males and juveniles. The sex ratio, defined as females : total males + females, exceeded 0.5 during most of the study period. Brood size was significantly coupled with ovigerous female size. Two to four cohorts appeared at each study period. New cohorts occurred at almost every sampling except in the samples Jun-2, and Nov-2. Life span was estimated at 1-2 months. The juvenile ratio, the ratio of ovigerous females, and the recruitment rate estimated by FiSAT were commonly high in summer and winter. The life history of S. valida was not coupled with water temperature, but had a strong seasonal pattern.
Patricio De Los Ríos-Escalante, Eliana Ibáñez-Arancibia
Published: 13 April 2021
Crustaceana, Volume 94, pp 407-412; https://doi.org/10.1163/15685403-bja10090

Abstract:
The brachyuran crab, Leurocyclus tuberculosus (H. Milne Edwards & Lucas, 1842) is widely distributed along the Atlantic coast of South America, but there are no precise records about its occurrence on the Chilean Pacific coast. The present study is a description of four juvenile specimens of L. tuberculosus collected from an intertidal prairie of Gracilaria sp. in an inner sea in Chile (41°S, Puerto Montt). According to existing literature, the specimens would be juvenile individuals belonging to L. tuberculosus that, in accordance with the literature, was described as probably inhabiting the Chilean coasts without more details. The literature revealed that this species is widely distributed along the Atlantic coasts of South America, and can also, probably due to dynamic oceanographic processes, be present on the southern Pacific coast.
Kunihiko Izawa
Published: 13 April 2021
Crustaceana, Volume 94, pp 447-465; https://doi.org/10.1163/15685403-bja10100

Abstract:
Orbitacolax bispinus sp. nov., Orbitacolax leptoscari (Yamaguti, 1953), Paraorbitacolax sphyraenae Izawa, 2021, and one male specimen of a Bomolochidae sp. are (re)described. The male and copepodid V female of O. leptoscari, and the male and copepodid V male of P. sphyraenae are described for the first time for the respective species. A description performed in Izawa (2020, 2021) that the maxilliped of the female bears a dorsal process in Orbitacolax and Paraorbitacolax spp., was wrong and is herein corrected.
Published: 13 April 2021
Crustaceana, Volume 94, pp 467-486; https://doi.org/10.1163/15685403-bja10104

Abstract:
The distribution of the semi-terrestrial burrowing crayfish Creaserinus fodiens (Cottle, 1863) in Ontario was updated based on the examination of the records stored in the crayfish database of the Royal Ontario Museum in Toronto and specimens collected during field studies. New Ontario locality records are reported for this crayfish species from MacGregor Point Provincial Park and other nearby sites in Bruce County, along the shores of Lake Huron. These are among the northernmost locality records reported for this species in North America. These new records represent a northwestern range expansion for this crayfish species in southern Ontario. As a result of these new records, the revised distribution of this species in Ontario is estimated to cover an area of about 32 620 km2. This is an increase of 7620 km2 over a previous 1996 estimate of this range. Creaserinus fodiens is a vulnerable species in Ontario, mainly due to the loss of suitable wetland habitats. Thus, the new locations and the range expansion reported here provide some hopeful news about the long-term future of burrowing crayfishes in this Canadian province. At some of the new locations, C. fodiens was found together with Faxonius immunis (Hagen, 1870), another burrowing crayfish species. However, this analysis of all the relevant records found in the collections of the Royal Ontario Museum (Toronto) and the Canadian Museum of Nature (Ottawa) shows that our knowledge of the distribution of C. fodiens in Ontario remains quite incomplete. A survey of the conservation status and challenges for this crayfish species in various regions of North America was also undertaken.
D. V. Axenov-Gribanov, Y. A. Rzhechitskiy, M. M. Morgunova, V. A. Emshanova, Y. A. Lubyaga, K. P. Vereshchagina, A. N. Luzhetskyy
Published: 13 April 2021
Crustaceana, Volume 94, pp 393-405; https://doi.org/10.1163/15685403-bja10109

Abstract:
Lake Baikal provides a unique opportunity to study oxyphilic organisms in the focus of their adaptive abilities, and antioxidant potential. The purpose of this study was to estimate the changes in metabolic profiles and reactions of antioxidant capacities in Baikal endemic amphipods to the stress of high oxygen content. As a result of our study we have found that a high level of oxygen in the environment leads to the activation of a specific adaptive response in endemic organisms, which are naturally resistant to short-term increased concentrations of oxygen. Exposing animals to high oxygen concentrations causes both activation, i.e., use, and concurrently apparent inhibition of the synthesis of some low molecular weight natural compounds (whose specific nature is yet to be determined) in these endemic amphipods. This could be explained by the animals’ response to oxidative stress and stress-induced synthesis of natural compounds as adaptation mechanisms. At the same time, the reactions of elimination of some natural products found in metabolic profiles can be explained by the specific reduction of target metabolites or molecules neutralizing oxygen radicals and decreasing their content during exposition to current stress conditions. We also noted species-specific, stress-dependent changes in the antioxidant capacity of amphipods. Thus, the newly described mechanisms of stress resistance and newly found molecules in these endemic crustaceans can become a basis for development of new potential natural products, e.g., drugs, the action of which should be aimed at elimination or at least reduction of oxidative stress in organisms and its undesired consequences.
H. P. Wagner, K. Van Damme
Published: 13 April 2021
Crustaceana, Volume 94, pp 487-506; https://doi.org/10.1163/15685403-bja10115

Abstract:
A new species of the thermosbaenacean genus Tethysbaena Wagner, 1994 (Crustacea: Peracarida: Thermosbaenacea) is described based on females from a freshwater cave lake and a brackish coastal well on Socotra Island (Yemen) as Tethysbaena dioscorida n. sp. It is the first representative of the Thermosbaenacea that is described from the Socotra Archipelago and the first member of the order known from an Indian Ocean island. The new species is the eighth known member of what is considered the “Tethysbaena relicta” species-group, which is known from Oman (four species), Somalia (one species), Israel (two species) and now Socotra Island (one species). The new species shows closest morphological affinities with T. barbatula Wagner, 2020 from Oman. We suggest that the speciation in this well-defined species-group is due to regressions of the Tethys Sea and the appearance of dry land since the Oligocene-Miocene boundary to the present time, forming major barriers and creating isolated populations of the ancestral species. Also the potential biocrisis in Socotra as a result of developmental activities during the last decades is mentioned, which may affect the subterranean faunas in particular in coastal areas, exemplified by the destruction of one of only two localities where the new species was found.
Kunihiko Izawa
Published: 2 March 2021
Crustaceana, Volume 94, pp 343-356; https://doi.org/10.1163/15685403-bja10093

Abstract:
Taeniacanthus aulacocephali sp. nov. recovered from Aulacocephalus temminckii Bleeker, 1855 (Serranidae) is described and T. sebastichthydis Yamaguti, 1939 collected from Sebastiscus marmoratus (Cuvier, 1829) and Sebastes inermis Cuvier, 1829 (Sebastidae) is redescribed. The male, copepodid V male, both sexes of copepodid IV, and copepodid II of the latter species are herein described for the first time.
Elena L. Markhaseva, Janet M. Bradford-Grieve, Jasmin Renz
Published: 2 March 2021
Crustaceana, Volume 94, pp 293-308; https://doi.org/10.1163/15685403-bja10084

Abstract:
A new calanoid copepod, Sursamucro rostratus sp. nov., belonging to the family Aetideidae, is described from female specimens collected in the northern Pacific and South Atlantic from abyssal waters close to the sea bed. The new species is the second of a rare deep-water genus, Sursamucro; it differs from its congener in size, configuration of the rostrum, the shape of the posterior corners of the prosome and details of antenna, mandible, maxillule and P1 setation. The genus Sursamucro is recorded for the first time from the northern Pacific and the Atlantic Ocean.
Adriana N. A. F. Ibrahim, Ilan Karplus, Wagner C. Valenti
Published: 2 March 2021
Crustaceana, Volume 94, pp 325-341; https://doi.org/10.1163/15685403-bja10081

Abstract:
The large size variation of Macrobrachium amazonicum reflects a complex population structure that consists of four morphotypes, called TC (Translucent Claw), CC (Cinnamon Claw), GC1 (Green Claw 1), and GC2 (Green Claw 2). The effect of the largest morphotype (GC2) claws on development and behaviour of the smallest male morphotype (TC) was analysed through manipulations of the large prawn’s second pair of claws. TC males were paired for 75 days in aquaria with (a) an intact GC2, (b) a GC2 with immobilized dactyls, and (c) a GC2 without chelipeds. Isolated TC males served as a control. The maintenance activities of TC males and social interactions with the GC2 morphotype were monitored. Survival and growth of TC males was lower in relation to the control when they were paired with intact GC2 males. Aggressive interactions were carried out almost exclusively by GC2 and strongly affected the behaviour of the small prawns. The absence of chelipeds and immobilization of dactyls in GC2 prawns reduced the negative effect on the development of TC males and agonistic behaviour. The social interactions between GC2 and TC prawns reflect a stable dominance hierarchy. The large claw of the GC2 morphotype plays a major role in the social interaction.
Dong Dong, Quddusi B. Kazmi, Feroz A. Siddiqui
Published: 2 March 2021
Crustaceana, Volume 94, pp 381-386; https://doi.org/10.1163/15685403-bja10112

Abstract:
The porcellanid crab Lissoporcellana demani Dong & Li, 2014 is reported for the first time from southeast Africa, based on material collected from trawls off Mozambique during the International Indian Ocean Expedition in 1963-1964. Lissoporcellana demani has been known only from the western Pacific, and the present specimens greatly extend the previously known distribution range of this species to the western Indian Ocean. Illustrations of a specimen are provided. Morphological variations of L. demani and characters distinguishing it from closely related congeneric species are discussed.
Dongdong Zhang, Xiaodong Jiang, Lu Zu, Wenquan Zhou, Min Luo, Yongxu Cheng, Xugan Wu
Published: 2 March 2021
Crustaceana, Volume 94, pp 309-324; https://doi.org/10.1163/15685403-bja10094

Abstract:
There are three major wild populations of mitten crab (Eriocheir sensu stricto), Suifenhe River (SF), Tumenjiang River (TM) and Liaohe River (LH) in northern China. However, the information on the nutritional quality of these three populations of crabs is still scarce. Thus, we investigated and compared the tissue indices, total edible yield, proximate composition, fatty acid compositions and amino acid contents of these wild crab populations. We showed that: (1) TM population had the highest meat yield among the three populations; (2) TM recorded the highest moisture and the lowest total lipid content in ovary and muscle; (3) a higher level of total n-3 poly-unsaturated fatty acids was found in TM, except for the ovary in SF; (4) the three populations had similar essential amino acids scores. In conclusion, Eriocheir s.s. from these three populations all showed a high nutritional quality suitable for humans, especially the TM, which contains more eicosapentaenoic acid and docosahexaenoic acid.
Chafia Hamida, M. Hichem Kara
Published: 2 March 2021
Crustaceana, Volume 94, pp 283-292; https://doi.org/10.1163/15685403-bja10051

Abstract:
A previous record of the alien crab Callinectes sapidus from the Algerian coasts was based on a photograph provided by a fisherman showing the dorsal side of a single individual. In this contribution, we confirm this presence in the mouth of the Mafragh Estuary in eastern Algeria, where four individuals of this species were found on 19 November 2019. The specimens examined are one female (60 mm CL, 125.9 g) and three males (60-66 mm CL, 120.4-176.8 g). This discovery confirms the presence of this species in the southwestern Mediterranean Basin where it could become invasive in suitable habitats.
Caitlin C. Bloomer, Robert J. DiStefano, Christopher A. Taylor
Published: 2 March 2021
Crustaceana, Volume 94, pp 357-379; https://doi.org/10.1163/15685403-bja10098

Abstract:
Burrowing crayfishes have historically lacked life history data due to their elusive nature and difficultly extracting them from burrows. This review provides a synopsis of current literature on burrowing crayfishes’ life histories and a quantitative analysis of published life history content. Only 69 publications covering 94 burrowing species (approx. 39%) met our criteria for a life history study. Many species had only partial life histories documented and two genera (Engaewa and Tenuibranchiurus) had no life history studies available. Size and reproductive season were the most recorded traits across studies while others such as mortality and age/size at molting events were rarely recorded. Reproductive investment, an important predictor of imperilment, was lacking in 87% of burrowing species. Our review emphasizes the need to include life history data with new species descriptions and conduct basic life history studies to effectively assess data-deficient species and protect the future of our threatened burrowing crayfishes.
Hai-Jing Xu, Jian-Wen Li, Yi-Lai Chen, Jin-Shu Yang, Wen-Ming Ma, Guo-Ying Qian
Published: 2 March 2021
Crustaceana, Volume 94, pp 263-281; https://doi.org/10.1163/15685403-bja10096

Abstract:
The insulin signalling pathway is one of the most studied pathways, including ovary maturation and female reproduction. However, downstream elements involved in this cascade remain unknown. Here, we identified and characterized an insulin-like receptor (IR) in female Macrobrachium rosenbergii, and named as Mro-IR. The deduced Mro-IR contained conserved domains of IR proteins, including two ligand-binding domains, a furin-like domain, two fibronectin-3 domains, a transmembrane domain and an intracellular tyrosine kinase domain in order. Multiple sequence alignment of the first ligand-binding domain and the tyrosine kinase domain in Mro-IR revealed a high degree of similarity to other representative IRs. Mro-IR was clustered into a separate branch with IRs from decapods by phylogenetic analysis. Additionally, tissue distribution analysis showed that Mro-IR was uniquely expressed in the ovary of M. rosenbergii. This study would possibly provide a new highlight to the molecular mechanism of insulin-like signalling cascade, regulating female sexual differentiation in crustaceans.
Mulyadi
Published: 15 February 2021
Crustaceana, Volume 94, pp 141-158; https://doi.org/10.1163/15685403-bja10036

Abstract:
Two new species of Labidocera from Indonesian waters are herein described. Labidocera baliensis n. sp. is distinguishable in the female by the posterior corners of Pdg5 being rounded and equipped with a sub-posterior spine, the left side of Ur1 with a stout spine-like process, and the form of the P5; in the male by the Ur1 smooth and the very slender shape of P5. Labidocera gagensis n. sp. is distinguishable in the female by having 7 spine-like processes on Ur1, the structure of 6 spine-like processes on the posterior end of Ur2 and the form of P5; in the male by the long spine at the right posterior part of Ur1; and the 5 spine-like processes on the right posterior corner of Pdg5 as well as the form of P5. The relationships between the “detruncata” and “kroyeri” groups are discussed and defining characterizations of the species and of the species groups are provided.
Hsi-Te Shih, Martyn E. Y. Low, Peter K. L. Ng
Published: 15 February 2021
Crustaceana, Volume 94, pp 207-225; https://doi.org/10.1163/15685403-bja10077

Abstract:
The nomenclature of two ocypodid names, Cancer vocans minor Herbst, 1782 and Gelasimus caerulens Adams, 1847, is discussed, because their identities have remained unresolved. The former is identified with Gelasimus annulipes H. Milne Edwards, 1837, and the latter with Mesuca (Latuca) paradussumieri Bott, 1973. To conserve the current and widespread usage of both junior synonyms, Article 23.9 of the Zoological Code is applied to reverse precedence. Neotypes are also designated for both species.
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