CATALOG OF ORIGINAL DESCRIPTIONS: Guembelina costulata Cushman 1938

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Guembelina -> Guembelina costulata
Other pages this level: G. acervulinoides, G. barnardi, G. boliviniformis, G. carinata, G. cenomana, G. complanata, G. conjakica, G. costulata, G. crinita, G. cubensis, G. cubensis heterostoma, G. dagmarae, G. deflaensis, G. distorta, G. excolata, G. fructicosa, G. garretti, G. glabrans, G. globocarinata, G. globulosa dibrarica, G. globulosa striatula, G. goodwini, G. malocaucasica, > >>

Guembelina costulata

Citation: Guembelina costulata Cushman 1938
Rank: Species
Type locality: Gully north of road, west of iron bridge over branch of Kickapoo Creek, 1.9 m. northwest of Annona, Red River County, TX.
Type age: Maastrichtian
Type sample and level: upper part of the Taylor marl
Holotype Repository: Washington; USNM
Type & figured specimens: Pl. 3, figs. 7-9; 24387

Linked specimens: USNM-24387 USNM-24388 USNM-31745

Current identification/main database link: Pseudoguembelina costulata (Cushman, 1938)


Original Description
Test 1½-2 times as long as broad, rather rapidly taperipg, initial end often acute with a slight point, somewhat compressed, earlier portion with the periphery slightly keeled, later portion: slightly idented; chambers slightly inflated, mostly broader than high, last ones with the inner portion reduced in height; sutures in the early portion slightly limbate and little if at all depressed, later depressed and slightly curved; wall ornamented throughout with fine longitudinal costae, becoming somewhat·curved and nearly parallel to the periphery in the later part; aperture semi­ circular, with a slightly thickened lip.

Size: Length 0.25-0.30 mm.; breadth 0.15-0.20 mm.; thickness 0.10 mm.

Extra details from original publication
This species differs from G. striata in the smaller size, com­pressed test, lower and broader chambers and distinctly· costate surface throughout. It occurs in greatest numbers in the middle and upper portions of the Taylor marl and its equivalents, but also continued on through the Navarro where it evidently gave rise to the somewhat larger and more coarsely ornamented G. excolata.

Editors' Notes
Test biserial, slender, with slightly reniform adult chambers. Costae continuous, following the curve of the chambers. Aperture a high arc, with small flanges that curve back from the aperture. Up to 4 adult chambers may have accessory apertures, which are covered by a tube-like lid, directed toward the median suture.

References:

Cushman, J. A. (1938). Cretaceous species of Guembelina and related genera. Contributions from the Cushman Laboratory for Foraminiferal Research. 14: 2-28. gs :: ::


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Guembelina costulata compiled by the pforams@mikrotax project team viewed: 14-7-2020

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