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Abstract

The shallow-marine carbonate deposits of the Reuchenette Formation (Kimmeridgian, Upper Jurassic) in

northwestern Switzerland and adjacent France yield highly diverse bivalve associations, but only rarely contain

remains of pinnid bivalves. The three occurring taxa Pinna (Cyrtopinna) socialis d’Orbigny, 1850, Stegoconcha

granulata (J. Sowerby, 1822) and Stegoconcha obliquata (Deshayes, 1839) have been revised. A lectotype for

Pinna (C.) socialis was designated and the taxon is assigned herein to P. (Cyrtopinna) Mörch, 1853, the first record

of the subgenus from the Jurassic. A brief review of Stegoconcha Böhm, 1907 revealed two species groups

within the genus. Species close to the type species S. granulata are characterized by a nearly smooth anterior

shell, followed posteriorly by deep radial furrows and rows of pustules covering the dorsal flank. Another group

comprises radially ribbed species related to S. neptuni (Goldfuss, 1837). It includes among others the Paleogene

species S. faxensis (Ravn, 1902), extending the known range of Stegoconcha from the Middle Jurassic into the

Paleogene. The paper suggests a relationship between Stegoconcha and the Cretaceous Plesiopinna Amano,

1956, with S. obliquata as a possible intermediate species leading to Plesiopinna during the Early Cretaceous.

Furthermore, a possible relationship between Stegoconcha and Atrina Gray, 1842 is discussed.

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Authors and Affiliations

Jens Koppka

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