CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana fundiconulosa Subbotina 1953
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Original Description [Translation from the Russian].--Test planoconvex, with a flattened dorsal side and a conically convex ventral side. Peripheral margin weakly lobate, angular, with two very close keels which have the shape of a small braid-like thickening. The space between the keels is a narrow groove, or, in forms in which the keels are more widely separated, like a narrow ribbon-like strip. There are three whorls, with six to eight chambers per whorl. Very infrequently, forms with five chambers per whorl are found. Chamber shape on the dorsal side is the same as in Globotruncana arca (Cushman) [Pulvinulina arca, 1927]; on the ventral side, chambers are more elongate along the axis of coiling in length than in width. On the dorsal side, sutures are arcuate, with sutural rims represented by a series of tubercle-like swellings (granules). On the ventral side, sutures are depressed, straight or slightly curved, sometimes (rarely) with a slight tendency to become sinuous as the S-shaped sutures of Globotruncana ex gr. lapparenti type, because the chambers on the ventral side sometimes overlap one another.
Umbilicus large, with rim-like thickenings along the margin. Aperture opens onto the umbilicus, and at the same time it represents the orifice at the base of the wall separating the chambers. The aperture is an upward- and forward-curved slit. Wall finely spinose.
References:
Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs
Globotruncana fundiconulosa compiled by the pforams@mikrotax project teamviewed: 17-4-2025
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