Foraminiferida Eichwald, 1830

Less, György & Özcan, Ercan, 2008, The late Eocene evolution of nummulitid foraminifer Spiroclypeus in the Western Tethys, Acta Palaeontologica Polonica 53 (2), pp. 303-316 : 310

Order Foraminiferida Eichwald, 1830 Family Nummulitidae de Blainville, 1827 Genus Spiroclypeus Douvillé, 1905

Type species: Spiroclypeus orbitoideus Douvillé, 1905 , late Aquitanian , river Tabalong, close to Tandjong (Borneo)

Remarks.—Based on the parameters evaluated above, Western Tethyan late Eocene Spiroclypeus can be grouped into two species. They can be discriminated using the number of the undivided neanic chambers (X). Based on our data ( Table 1) Xmean = 2.7 is the most suitable value to separate Spiroclypeus sirottii with more undivided chambers from S. carpaticus with fewer. The classification of particular populations in the different taxa is reported in Table 1. Stratigraphical ranges of particular taxa are given in advance.