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1 October 2021 Systematic Revision and Palaeobiology of Emplastron edwardsi (Van Straelen, 1928) gen. et comb. nov. (Crustacea, Decapoda, Astacidae) Entombed within Travertine, from Sézanne, France
Robert J. O'Flynn, Denis Audo, Tadashi Kawai
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Abstract

Crayfish are rare in the fossil record and therefore it is important to investigate each occurrence in detail. The only known fossil crayfish from France, Astacus edwardsi Van Straelen, 1928, is known from a replica made by pouring plaster of Paris inside the holotype (subsequently destroyed), an external mould extracted from a travertine cavity from the Thanetian of Sézanne. An evaluation of the taxonomic name, A. edwardsi, is provided; A. edwardsi is considered valid in accordance with ICZN rulings. It possesses atypical features for all other astacid genera, thus Emplastron gen. nov. is erected. Emplastron edwardsi gen. et comb. nov. inhabited a warm climate with calm waters, abundant food sources, and an ample supply of calcium carbonate: so much so that it is surprising that it is the only recovered specimen. Despite apparent North American faunal and floral affinities in the vicinity, E. edwardsi is more closely related to European crayfishes than it is to American ones.

© by the Palaeontological Society of Japan
Robert J. O'Flynn, Denis Audo, and Tadashi Kawai "Systematic Revision and Palaeobiology of Emplastron edwardsi (Van Straelen, 1928) gen. et comb. nov. (Crustacea, Decapoda, Astacidae) Entombed within Travertine, from Sézanne, France," Paleontological Research 25(4), 379-388, (1 October 2021). https://doi.org/10.2517/2021PR007
Received: 26 March 2020; Accepted: 27 July 2020; Published: 1 October 2021
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KEYWORDS
Astacus edwardsi
freshwater crayfish
palaeogeography
Sézanne
Thanetian
travertine
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