Données paléobiologiques et paléobiogéographiques sur quelques Strophochonetinae du Dévonien d'Espagne et du Massif Armoricain

Authors

  • JENARO L. GARCIA-ALCALDE,

    1. Departamento de Paleontologia, Universidad de Oviedo, Oviedo, Spain
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  • PATRICK R. RACHEBOEUF

    1. Laboratoire de Paléontologie ei Stratigraphie, Institut de Géologie de l'Université, B.P. 25 A, F-35031–Rennes Cedex, France, et Centre National de la Recherche Scientifique (R.C.P. No. 240)
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Abstract

The lack of hinge spines on the left side of the ventral valve in Chonetacea is demonstrated here for the first time. This morphological peculiarity has a special bearing on the evolutionary trends of the Strophochonetinae. The existence of several species of Chonetacea, both in the Armorican Massif, the Cantabrian Mountains, and Aragon, is a new fact which confirms very close relations between these three areas during Lower Devonian times.

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