Reconsideration of skeletal development of Chelydra serpentina (Reptilia: Testudinata: Chelydridae): evidence for intraspecific variation
Open Access
- 1 March 2005
- journal article
- Published by Wiley in Journal of Zoology
- Vol. 265 (3), 235-267
- https://doi.org/10.1017/s0952836904006296
Abstract
Patterns of formation and sequence of ossification of the entire skeleton are described for the snapping turtle Chelydra serpentina, based on new and previously published data. Differences in the sequences of ossification events are described and demonstrate considerable intraspecific variation in these developmental data. The chondrocranium of a late developmental-stage specimen is described and illustrated as baseline data for comparative studies. Patterns of formation and chondrification of forelimb and hind limb elements are generally consistent with those of previous studies; however, conspicuous differences in the patterns of ossification are observed among metapodial and phalangeal elements. In the cranium, patterns of ossification of dermal elements are generally more variable than are those of endochondral elements of the braincase, and as in previous studies, endochondral elements ossify after dermal elements. Documented intraspecific variation in sequence and timing of formation, chondrification, and ossification of skeletal elements should serve as a caveat for those conducting studies of phylogeny, heterochrony, and evolution with these data. Causes of natural and induced variation are discussed briefly.Keywords
This publication has 39 references indexed in Scilit:
- Staging criteria for embryos of the spiny softshell turtle,Apalone spinifera(testudines: Trionychidae)Journal of Morphology, 2002
- Normal Embryonic Stages of the Chinese Softshelled Turtle Pelodiscus sinensis (Trionychidae)Zoological Science, 2001
- Ageing the eggs and embryos of the pig-nosed turtle, Carettochelys insculpta (Chelonia: Carettochelydidae), from northern AustraliaCanadian Journal of Zoology, 2000
- Conservation Genetics of the Common Snapping Turtle (Chelydra serpentina)Conservation Biology, 1996
- Studies on skeleton formation in reptiles. v. Patterns of ossification in the skeleton of Alligator mississippiensis DAUDIN (Reptilia, Crocodylia)Zoological Journal of the Linnean Society, 1993
- The development and homology of the chelonian carpus and tarsusJournal of Morphology, 1985
- Notes on the Reproduction of Kinosternon subrubrum (Testudines: Kinosternidae) in East TexasThe Southwestern Naturalist, 1983
- The Anterior Brain-case and Interorbital Septum of Sauropsida, with a consideration of the Origin of Snakes.Journal of the Linnean Society of London, Zoology, 1949
- SOME PROBLEMS CONCERNING THE DEVELOPMENT OF THE SKULL OF TURTLESActa Zoologica, 1945
- The development of the skull of emys lutariaJournal of Morphology, 1912