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Upper Middle Devonian (Givetian) gastropods from the Kersadiou Formation, Brittany, France

Published online by Cambridge University Press:  20 May 2016

Robert B. Blodgett ,
Jiřá Frýda  and
Patrick R. Racheboeuf
Robert B. Blodgett
Affiliation:
Departments of Zoology and Geology, Oregon State University, Corvallis, Oregon 97331,
Jiřá Frýda
Affiliation:
Český geologický ústav, Klárov 3/131, 118 21 Praha 1, Czech Republic,
Patrick R. Racheboeuf
Affiliation:
Departément des Sciences de la Terre, UMR 5565 of the CNRS, Université Claude-Bernard Lyon 1, Bd. du 11 Novembre, F69622 Villeurbanne Cedex, France,
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Abstract

Gastropods are described for the first time from the Kersadiou Formation (middle Givetian) in the vicinity of Brest, Brittany, northwestern France. Twenty-three species of gastropods are recognized. New taxa include the new genera, Calvibembexia, Kersadiella, Breizospira, Finisterella, Parahormotomina, and Nodoloxonema, represented by the new species Calvibembexia lethiersi, Kersadiella babini, Breizospira crozonensis, Finisterella tibidiensis, Parahormotomina sibertae, and Nodoloxonema plusquelleci. Further new species include: Sinuitina (Sinuitina) morzadeci, Crenistriella armoricana, Patellilabia (Phragmosphaera) ponceti, Angyomphalus (Eoangyomphalus) weyanti, Eoplatyzona ongaroae, Murchisonia oehlerti, and Hormotomina fiacrensis. The biogeographic affinities of the fauna show a strikingly unusual admixture of Eastern Americas Realm taxa such as Hormotomina and Crenistriella. This suggests that during the middle Givetian, the Massif Armoricain (northwestern France) represented an area of Realm-boundary mixing between the Old World and Eastern Americas Realms, while older Devonian gastropod faunas of the Massif Armoricain are wholly of Old World Realm type.

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Research Article
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Journal of Paleontology , Volume 73 , Issue 6 , November 1999 , pp. 1081 - 1100
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Copyright © The Paleontological Society 

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