Original Description Test small, low to medium trochospiral, with convex spiral side; chambers globular to subglobular, about 11-13 slowly enlarging chambers arranged in 2 whorls, 4-5 chambers in final whorl; sutures radial on umbilical (involute) side, radial to slightly curved on spiral (evolute) side; umbilicus small to closed; wall microperforate and pustulate; aperture a low arch, intra umbilical, bordered with a thin lip, but lacking a bulla. Stratigraphic range. Eocene?-Oligocene to Holocene. Size: Etymology: Extra details from original publication Remarks -Tenuitellinata is superficially similar to Tenuitella, but differs in apertural details. In Tenuitella, the aperture is always umbilical-extraumbilical (-peripheral), but species of Tenuitellinata possess an intraumbilical aperture. Tenuitellinata may have evolved from Tenuitella by migration of the aperture to the umbilicus; hence they are phylogenetically closely related. Separation of this new genus from Tenuitella is to mark an evolutionary stage, which may then have evolved into bullate Globigerinita.
Stratigraphic range - Eocene?-Oligocene to Holocene.
Tenuitellinata angustiumbilicata (Bolli)
Tenuitellinata juvenilis (Bolli)
Tenuitellinata cf. T. pseudoedita (Subbotina)
Li, Q. (1987). Origin, phylogenetic development and systematic taxonomy of the Tenuitella plexus (Globigerinitidae, Globigerininina). Journal of Foraminiferal Research. 17: 298-320. gs
Tenuitellinata compiled by the pforams@mikrotax project teamviewed: 5-7-2022