Foraminifera taxon details
From editor or global species database
Diagnosis Test planoconvex to biconvex, trochospiral, with one and a half to four whorls and up to sixteen chambers in the final whorl, sutures curved, thickened, umbilicus closed with an umbilical plug, periphery with narrow keel; wall calcareous, finely perforate, surface smooth to sculptured; aperture a small basal arch near the periphery on the umbilical side, extending as a slit around the umbilical end of the chamber where it connects to a loop like opening that later is closed by a porous plate as the next chamber is added, the arched opening remaining as an intercameral foramen. L. Cretaceous (Hauterivian to L. Aptian); USSR: Southeast Caucasus. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
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