Europrotomus (Mollusca: Caenogastropoda: Strombidae): A new Middle Miocene European strombid genus (Revision of Euprotomus Gill, 1870. Part 4)

Abstract

The medium-sized, strongly ornamented nominal species Strombus schroeckingeri Hörnes in Hoernes & Auinger, 1884 is well known from Langhian deposits of the Paratethys Sea. Its traditional generic affiliation in the literature with Euprotomus Gill, 1870, implicated a biogeographic relation of the Paratethys and the proto-Mediterranean with the Neogene Indo-West-Pacific region. This relation, however, is problematic because the Tethys Seaway was already closed or a very shallow, strongly evaporitic passage at that time. Despite its superficial similarity with extant genera of the IWP region, the genus is unrelated to all known strombid genera and represents a new genus, which is introduced herein as Europrotomus nov. gen. The genus comprises only one or maybe two species, which occur in the European Middle Miocene geological record. No ancestors are known so far. This sudden occurrence is discussed as immigration from an adjacent bioprovince rather than as a result of autochthonous evolution. Hypothetically, such a biogeographic source area might have been established along the coasts of tropical West Africa-a scenario that is already documented for Pleistocene times. © 2011 Springer-Verlag.