Some Middle Cretaceous Ostracoda from Northern Spain and their Interregional Relationships

• F.M. Swain ^{[1] [2]}
  1. [1] University of Minnesota

     University of Minnesota

     City of Minneapolis, Estados Unidos

     
  2. [2] University of Delaware

     University of Delaware

     Estados Unidos

     
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 10, Nº. 2, 1978, págs. 245-265
• Idioma: inglés
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• Resumen

  • Nineteen species of marine Ostracoda are described from early Turonian beds of Asturias Province, northern Spain. Two of the species are new: Pontocyprella navensis, n. sp., and Cythereis damottae, n. sp.; eight are assigned to described species; and 9 are left in open nomenclature or given affinitive assignments.

    The fauna is typical of late Cenomanian and early Turonian ostracode assemblages of the circum-Atlantic region in having many endemic elements. The high degree of endemism shown by late Cenomanian and early Turonian ostracodes is suggested to have been caused by irregular disposition, during those Stages, of marine habitats favorable for ostracodes, reflecting general emergent conditions.

    The late Cenomanian and early Turonian Stages in the eastern Atlantic (based on contained ammonites) seem to have many common or closely related, unifying ostracode species. Risaltina aquitanica Colin and Grekoff, Pterygocythere group of P. allinensis (Grekoff and Deroo), Ovocytheridea spp. and others comprise a Tethyan late Cenomanian to early Turonian Assemblage Zone in southern Europe and northern Africa. In eastern and southern North America, although similarities exist, ostracode faunas were developing independently as well as having some Boreal affinities.