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Book Chapter

Teranota and its implications on anomalodesmatan phylogeny

By
Nicole S. Rogalla
Nicole S. Rogalla
Institut für Geologie und Paläontologie der Philipps-Universität Marburg, Abteilung Invertebraten-Paläontologie, Hans-Meerwein-Strasse, 35032 Marburg, Germany (e-mail: rogalla@mailer.uni-marburg.de & amler@mailer.uni-marburg.de)
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Michael R. W. Amler
Michael R. W. Amler
Institut für Geologie und Paläontologie der Philipps-Universität Marburg, Abteilung Invertebraten-Paläontologie, Hans-Meerwein-Strasse, 35032 Marburg, Germany (e-mail: rogalla@mailer.uni-marburg.de & amler@mailer.uni-marburg.de)
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Published:
January 01, 2000

Abstract

Bedded carbonaceous siltstones from the Buechel Subformation of the Bergisch-Gladbach–Paffrath Syncline, Germany, of Middle Devonian (Middle Givetian) age have yielded a remarkable sample of extremely elongated, articulated bivalves preserved in life orientation. The specimens are associated with a single left valve embedded horizontally in the bedding plane and further isolated but articulated shells. Combining the information given by the specimens and the palaeobiological interpretations allows the reconstruction of the complete morphology and probable life habits. The very distinct morphological features led to the erection of a new taxon, Teranota ebbighauseni Rogalla & Amler, 2000, provoking discussion on habitats, life habits and evolutionary trends in anomalodesmatan bivalves. A combination of characters typical of the orthonotids and the modiomorphids, as well as the preserved life position at an angle of some 60–70° relative to the bedding plane, suggests that these specimens were part of a minor branch off the main evolutionary lineages within the Anomalodesmata. It is proposed that these animals represent a convergent line of endobenthic bivalves distantly related to true siphonate forms.

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Contents

Geological Society, London, Special Publications

The Evolutionary Biology of the Bivalvia

E. M. Harper
E. M. Harper
Cambridge University, UK
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J. D. Taylor
J. D. Taylor
The Natural History Museum, UK
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J. A. Crame
J. A. Crame
British Antarctic Survey, UK
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Geological Society of London
Volume
177
ISBN electronic:
9781862394254
Publication date:
January 01, 2000

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