Systematics of some Late Ordovician encrinurine trilobites from Laurentian North America
- 1 November 2014
- journal article
- Published by Cambridge University Press (CUP) in Journal of Paleontology
- Vol. 88 (6), 1095-1119
- https://doi.org/10.1666/13-159
Abstract
Classification and relationships of the Ordovician encrinurines Frencrinoides Lespérance and Desbiens and Walencrinoides Lespérance and Desbiens are poorly understood, with little evidence for monophyly of either genus. We revise the type species of both genera, F. capitonis (Frederickson) and W. rarus (Walcott), using new and archival material. We explore their species composition and phylogenetic relationships with a parsimony analysis that includes 17 well-documented ingroup species that can be coded readily, and which is rooted with Encrinuroides regularis Parnaste, the oldest known encrinurine. The results support monophyly of Frencrinuroides and Walencrinuroides, albeit with more limited species membership than proposed by Lespérance and Desbiens. Previous suggestions that both E. uncatus Evitt and Tripp and E. neuter Evitt and Tripp should be assigned to Erratencrinurus Kruger are also supported by our analysis, as is monophyly of Physemataspis Evitt and Tripp. New species are W. rolfi and W. tremblayi.Keywords
This publication has 33 references indexed in Scilit:
- Tetralichine trilobites from the Upper Ordovician of Oklahoma and Virginia and phylogenetic systematics of the TetralichiniJournal of Paleontology, 2010
- The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to δ 13 C chemostratigraphyLethaia, 2009
- Facies development of a Late Ordovician mixed carbonate-siliciclastic ramp proximal to the developing Taconic orogen: Lourdes Formation, Newfoundland, CanadaFacies, 2007
- Bartonaspis new genus, a trilobite species complex from the base of the Upper Cambrian Sunwaptan Stage in North AmericaCanadian Journal of Earth Sciences, 2007
- Sequence stratigraphy and relative sea-level history of the Middle and Upper Ordovician of the Nashville Dome, TennesseeJournal of Sedimentary Research, 1998
- Orogeny and stratigraphy: Numerical models of the Paleozoic in the eastern interior of North AmericaTectonics, 1988
- Ordovician Formations and Faunas, Southern Mackenzie MountainsCanadian Journal of Earth Sciences, 1975
- III.—Trilobites from the Upper Stinchar Limestone (Ordovician) of the Girvan District, AyrshireTransactions of the Royal Society of Edinburgh, 1967
- I.—Trilobites from the confinis Flags (Ordovician) of the Girvan District, Ayrshire.Transactions of the Royal Society of Edinburgh, 1962
- The Lower Palæozoic Bedded Rocks of County WaterfordQuarterly Journal of the Geological Society, 1899