Citation: Globigerina inconstans Subbotina 1953Rank: SpeciesType specimens: 3992Type locality: holotype, fig. 1 from Zone of rotaliform globorotaliids, Elburgan Fm., Kuban River, N Caucasus= mid-part of Acarinina inconstans Zone of Leonova and Alimarina, 1961Type repository: St. Petersburg, Russia; VNIGRI
Original Description "Test with round or broadly oval outline consisting of 2-2 1/2 whorls to the spiral. Peripheral margin rounded, weakly lobulate. The early whorls are disproportionately small relative to the last whorl. They (the whorls) are situated either on the same plane as the last whorl or even below it. The last whorl contains 5-6 chambers which increase gradually in size; the last chamber is often considerably larger than the others. However, there are some individuals in which the last three chambers are of equal size.
Dorsal side very strongly compressed, ventral side convex, in certain forms conical. There is a well-defined, shallow umbilicus in the middle of the ventral side. Chambers spherical, closely packed together. The outline of the dorsal side of the chambers is rounded and that of the ventral side is either rounded or triangular.
Sutures simple, curved in the form of an arc. On the ventral side they radiate from the umbilicus. Aperture slit-like, situated along the marginal suture. Walls smooth, often finely cancellate. Dimensions: diameter 0.35-0.45 mm, thickness 0.12-0.20 mm."
Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs
Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs
Globigerina inconstans compiled by the pforams@mikrotax project teamviewed: 9-6-2023