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Contribution des motifs colorés résiduels dans la discrimination d’espèces nouvelles de Cryptochorda Mörch, 1858 (Mollusca: Gastropoda: Harpidae) de l’Éocène du bassin de Paris et du Cotentin

Jean-Michel PACAUD & Frédéric SAUTEREAU

fr Geodiversitas 42 (29) - Pages 559-595

Published on 17 December 2020

Contribution of residual colour patterns in the discrimination of new species of Cryptochorda Mörch, 1858 (Mollusca: Gastropoda: Harpidae) from the Eocene of the Paris Basin and the Cotentin peninsula

Ultraviolet light observation of residual color patterns on the shells of many Cenozoic gastropods provides characters to refine the description of fossil species. Here we apply this method to the discrimination of three species of Eocene Cryptochorda from the Paris Basin and Cotentin so far confused with the classical species Cryptochorda (s.str.) stromboides (Hermann, 1781). These species are named: Cryptochorda (s.str.) altavesna n. sp., C. (s.str.) neptis n. sp. and C. (s.str.) cosediensis n. sp. The stratigraphic and geographical distribution of type species C. (s.str.) stromboides is thus redefined. Cryptochorda (s.str.) teae n. sp. is also described from the Ypresian (Lower Eocene) of Italy. A historical review of the literature on the genus taxonomy is carried out and a biographical note is provided for Jean Hermann, descriptor of the type species Cryptochorda.


Keywords :

Harpidae, Cryptochordinae, residual colour patterns, shell character, Caenozoic, Eocene, France, Italy, neotypification, new species

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