Category: Globothalamea

Belongs within: Robertinida. The Epistomininae are Mesozoic and Cenozoic trochospiral foraminiferans with marginal apertures (Loeblich & Tappan 1964). Characters (Loeblich & Tappan 1964): Coiling predominantly sinistral; primary aperture on peripheral margin of chambers; internal partition joined to dorsal lip of aperture. <==Epistomininae    |–Epistominita Grigelis 1960LT64    |    `–*E. sudaviensis Grigelis 1960LT64    |–Rectoepistominoides Grigelis 1960LT64    |    `–*R. scientis Grigelis 1960LT64    |–Pseudoepistominella Kuznetsova in Bykova et al.… Continue reading Epistomininae

Belongs within: Rotaliida. The Uvigerinidae are a group of foraminiferans known from the Upper Cretaceous to the present. In the genus Uvigerina, the test is rounded in cross section with inflated chambers (Loeblich & Tappan 1964b). Characters (Loeblich & Tappan 1964b): Test triserial to biserial in early stage, later may become biserial or uniserial; aperture terminal… Continue reading Uvigerinidae

Belongs within: Rotaliida. The Buliminidae are a group of Foraminifera known from the Palaeocene to the present. Members of the type genus Bulimina have a tooth plate with a developed border, and with one shank free and the other fixed to the internal chamber wall below the aperture. In Praeglobobulimina, the tooth plate has a simple fold and… Continue reading Buliminidae

Belongs within: Globigerinana.Contains: Globigerina. The Globigerinidae are a group of planktonic Foraminifera known from the Upper Cretaceous Maastrichtian epoch to the present. The earliest members of the family are assigned to the subfamily Globigerininae (which survives to the present), characterised by a trochospiral to streptospiral test with the primary aperture umbilical or spiroumbilical. The Miocene… Continue reading Globigerinidae

Belongs within: Globigerinana. The Heterohelicidae are a group of planktonic foraminiferans known from the Late Cretaceous to the Oligocene. The test is planispiral or biserial in early stages and may develope chamber proliferation or serial reduction in later stages (Loeblich & Tappan 1964). Characters (Loeblich & Tappan 1964, as Heterohelicinae): Early stage planispiral or biserial,… Continue reading Heterohelicidae

Belongs within: Globorotaliida. The Rotaliporidae are a group of planktonic Foraminifera known from the Cretaceous. The primary aperture is more or less umbilical and marked by a prominent lip. Secondary sutural apertures may also be present on the umbilical side. The genera Clavihedbergella and Praeglobotruncana lack secondary apertures though the lips of previous chambers remain as projections into… Continue reading Rotaliporidae

Belongs within: Globigerinidae. Globigerina is a genus of planktonic forams known from the Palaeocene to the present. The test is trochospiral with globular chambers and an umbilical aperture (Loeblich & Tappan 1964b). Characters (from Loeblich & Tappan 1964b): Test free, trochospiral, chambers spherical to ovate; wall calcareous, perforate, radial in structure, surface may be smooth,… Continue reading Globigerina