Morrow 1934 pl30 f11.JPG
Morrow 1934 pl30 f18.JPG
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Morrow 1934 pl30 f11.JPG
Morrow 1934 pl30 f18.JPGLinked specimens: USNM-75380
Current identification:
Original Description
Test planoconvex, subconical, dorsal side slightly convex or flat, the sides of the cone flare near the periphery giving them a gently concave profile, umbilical cavity at the apex, small but distinct periphery keeled or very sharply rounded; chambers indistinct, about six in last whorl; sutures on ventral side may be slightly depressed on dorsal side, curved; wall smooth finely perforate; aperture elongate, extending along the inner edge of the last chamber
Size: Height of holotype 0.36 mm., thickness 0.18 mm.
Extra details from original publication
This species seems to be intermediate between the larger species G. micheliniana (d'Orbigny) (4, p. 31, pl. 3, figs. 1-3) which has a relatively higher and straighter sided cone, and an undescribed species in which the cone is lower than G. subconica, with a very sharply keeled periphery. The Ripley for, Gyroidina alabmensis (Sandidge (pp 283-284) differs from our species in being less compressed and in having convex ventral sides viewed from the side. This species has been found only in the basal Niobara where it is relatively common.
Morrow, A. L. (1934). Foraminifera and ostracoda from the Upper Cretaceous of Kansas. Journal of Paleontology. 8: 186-205. gsReferences:
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Globorotalia subconica compiled by the pforams@mikrotax project team viewed: 18-4-2021
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