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Albian Eoradiolites (Bivalvia: Radiolitidae) from Jabal NaÏmia, Gafsa Region, Tunisia, with revisional studies on the Albian forms of the genus

  • Jose Maria Pons (a1), Enric Vicens (a1), Fettouma Chikhi-Aouimeur (a2) and Hassen Abdallah (a3)

The external morphology and its variability, myocardinal apparatus, and shell structure of both valves of the radiolitid rudist Eoradiolites plicatus (Conrad) are described, based on the examination of about one hundred well-preserved, fairly complete specimens that are free of sediment matrix, found in a single bed of an ammonite-bearing Albian succession ('Knemiceras beds', Zebbag Formation) in central Tunisia. This study provides the most nearly complete knowledge of any Eoradiolites species to date. With this background, all previous records of E. plicatus, as well as the taxonomic status of the other Albian species of the genus, are revised considering both original material, when available, and published papers. As a result, the systematics of Eoradiolites is simplified.

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H. Abdallah , L. Memmi , R. Damotte , P. Rat , and F. Magniez-Jannin . 1995. Le Crétacée de la chaîne nord des Chotts (Tunisie du centre-sud): biostratigraphie et comparaison avec les régions voisines. Cretaceous Research, 16:487538.

G. Alencáster and P. García-Barrera . 2008. Albian radiolitid rudists (Mollusca: Bivalvia) from East-Central Mexico. Geobios, 41:571587.

M. M. El-Hedeni and A. M. El-Sabbagh . 2005. Eoradiolites liratus (Bivalvia, Radiolitidae) from the Upper Cenomanian Galala Formation at Saint Paul, Eastern desert (Egypt). Cretaceous Research, 26:551566.

M. Fenerci-Masse , J.-P. Masse , C. Arias , and L. Vilas . 2006. Archaeoradiolites, a new genus from the Upper Aptian of the Mediterranean Region and the origin of the rudist family Radiolitidae. Palaeontology, 49:769794.

J.-P. Masse , M. Fenerci-Masse , and S. Özer . 2002. Late Aptian rudist faunas from the Zonguldak region, western Black Sea, Turkey (taxonomy, biostratigraphy, palaeoenvirontment and palaeobiogeography). Cretaceous Research, 23:523536.

J.-P. Masse and M. Gallo-Maresca . 1997. Late Aptian Radiolitidae (rudist bivalves) from the Mediterranean and Southwest Asiatic regions: taxonomic, biostratigraphic and palaeobiogeographic aspects. Palaeogeography, Palaeoclimatology, Palaeoecology, 128:101110.

J.-P. Masse , M. Gallo-Maresca , and E. Luperto-Sinni . 1998b. Albian rudist faunas from southern Italy: taxonomic, biostratigraphic and palaeobiogeographic aspects. Geobios, 31:4759.

J. M. Pons and E. Vicens . 2008. The structure of the outer shell layer in radiolitid rudists, a morphoconstructional approach. Lethaia, 41:219234.

T. Steuber and M. Bachmann . 2002. Upper Aptian-Albian rudist bivalves from northern Sinai, Egypt. Palaeontology, 45:725749.

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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
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