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Shell morphology, shell texture and species discrimination of Caribbean Tucetona (Bivalvia, Glycymeridae)

Published online by Cambridge University Press:  20 May 2016

Pascal E. Tschudin*
Affiliation:
Institute of Geology, University of Berne, and Institute of Geology and Paleontology, University of Basel, Bernoullistrasse 36, 4056 Basel, Switzerland,

Abstract

Previous descriptions of Tucetona lack a consistent system using diagnostic characters and only two recent Caribbean ‘species’ are recognized. In this study, textural and structural features of the Tucetona shell are examined and used as the basis for comparison to other glycymerids and in the recognition of morphospecies. Standard diagnostic characters based mainly on the cross-sectional shape of ribs and on hinge teeth ontogeny are presented and used to distinguish six recent Caribbean morphospecies. The shell texture has been examined by light and scanning electron microscopy, showing the interior of glycymerid hinge teeth structured by two bundles of crossed lamellar texture. Whereas European Glycymeris examined for comparison correspond in their hinge plate textures to the one found in Tucetona, differences from a Caribbean Glycymeris sp. are described. Simple lamellar, crossed-lamellar and cone complex crossed-lamellar textures showed the same basic crystallite subunits.

Type
Research Article
Copyright
Copyright © The Paleontological Society 2001

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