Foraminifera taxon details
From editor or global species database
Diagnosis Test small, subglobular, rapidly enlarging rounded chambers in low trochospiral coil of one and a half to two and a half whorls, three and a half to five chambers in the final whorl, spiral side with approximately level spire and very slightly depressed radial sutures, umbilical side with slightly depressed sutures around the closed umbilicus, final chamber ampullate, from the spiral side appearing somewhat smaller than the penultimate one but extending over the umbilicus on the opposite side as in Globigerinita, numerous small accessory apertures between bridgelike projections occur along the margin, periphery broadly rounded, peripheral outline lobulate; wall calcareous, very thin, finely perforate, smooth except for prominently developed pustules in the region adjacent to the sutures and umbilicus of the umbilical side; aperture of the early stage interiomarginal and umbilical, replaced by the row of small openings along the margin of the ampullate final chamber where this covers the earlier umbilicus. U. Oligocene to M. Miocene; Antarctic: Ross Sea. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
| |