Eobigenerina, a cosmopolitan deep-water agglutinated foraminifer, and remarks on late Paleozoic to Mesozoic species formerly assigned to Pseudobolivina and Bigenerina
CLAUDIA G. CETEAN, EIICHI SETOYAMA, MICHAEL A. KAMINSKI, THEODOR NEAGU, MIROSLAV BUBÍK, SORIN FILIPESCU, and JAROSŁAW TYSZKA
In: Kaminski, M.A. & Filipescu, S., (eds), 2011. Proceedings of the Eighth International Workshop on Agglutinated Foraminifera. Grzybowski Foundation Special Publication 16, 19-27.
The genus Eobigenerina (type species Bigenerina variabilis Vašíček, 1947) is re-described from a Cretaceous section in the Eastern Carpathians (Romania) and well material from the North Atlantic and western Barents Sea. The genus is defined by its biserial to uniserial chamber arrangement and is otherwise isomorphic to Bigenerina, differing in its solid, noncalcareous, silicified wall structure and older stratigraphic occurrence (Pennsylvanian to Eocene). A neotype is selected for the type species, Eobigenerina variabilis (Vašíček, 1947), and one new species, Eobigenerina kuhnti n.sp. is described herein. We also transfer some cosmopolitan agglutinated taxa described previously from deep-water Cretaceous deposits as Pseudobolivina, Bimonilina, and “Bigenerina" to our new genus Eobigenerina, to Parvigenerina Vella 1957, or to the more recently described genera Hagimashella Neagu & Neagu, 1995, Rashnovammina Neagu & Neagu, 1995 and Bicazammina Neagu & Neagu, 1995.
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