NDLI: Extraordinary diversity of feather stars (Echinodermata: Crinoidea: Comatulida) from a Lower Jurassic (Pliensbachian–Toarcian) rock reef of Feuguerolles (Normandy, France)

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Extraordinary diversity of feather stars (Echinodermata: Crinoidea: Comatulida) from a Lower Jurassic (Pliensbachian–Toarcian) rock reef of Feuguerolles (Normandy, France)

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Swiss Journal of Palaeontology : Volume 136, Issue 1, March 2017

Swiss Journal of Palaeontology : Volume 135

Swiss Journal of Palaeontology : Volume 134

Swiss Journal of Palaeontology : Volume 133

Swiss Journal of Palaeontology : Volume 132

Swiss Journal of Palaeontology : Volume 131

Swiss Journal of Palaeontology : Volume 130

Extraordinary diversity of feather stars (Echinodermata: Crinoidea: Comatulida) from a Lower Jurassic (Pliensbachian–Toarcian) rock reef of Feuguerolles (Normandy, France)

Content Provider	Springer Nature Link
Author	Hess, Hans Thuy, Ben
Copyright Year	2016
Abstract	Comatulid feather stars are rare fossils in the Early Jurassic, providing only patchy insights into the early evolution of the group. Here, we describe new finds of comatulids from the late Pliensbachian to late Toarcian of Feuguerolles, Calvados, France. They include new species belonging to four superfamilies. The dominant genus is Palaeocomaster, with P. structus n. sp. represented by centrodorsals. For Palaeocomaster, the family Palaeocomasteridae n. fam. is proposed; it is placed in the Superfamily Comatuloidea. Solanocrinites is represented by S. jagti n. sp. The new taxa Andymetra toarcensis n. sp. and Spinimetra chesnieri n. g. et n. sp. are Family incertae sedis. The diagnoses of Comatuloidea and Solanocrinitoidea are modified based on the new material. The paracomatulid Singillatimetra truncata n. sp. is represented by a columnal, as is Forcipicrinus normannicus n. g. et n. sp. tentatively assigned to Pentacrinitina, Family incertae sedis. The material indicates that an important early comatulid radiation took place prior to the Toarcian Oceanic Anoxic Event, creating some basic types of these free-living crinoids. Along with the stratigraphic distribution patterns of the co-occurring stalked crinoids including the isocrinids Pentacrinites collenoti, Isocrinus (Chladocrinus) basaltiformis, the millericrinid Amaltheocrinus amalthei, and the cyrtocrinids Cotylederma docens, Eudesicrinus mayalis, Praetetracrinus inornatus, Sacariacrinus n. sp. and Tetracrinus n. sp., the new feather star finds suggest that the Toarcian Oceanic Anoxic Event was not of major influence to crinoid diversity.
Starting Page	301
Ending Page	321
Page Count	21
File Format	PDF
ISSN	16642376
Journal	Swiss Journal of Palaeontology
Volume Number	136
Issue Number	2
e-ISSN	16642384
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-10-11
Publisher Place	Cham, Switzerland
Access Restriction	Subscribed
Subject Keyword	Comatulids Crinoidea Early Jurassic Normandy Toarcian oceanic anoxic event Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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