Catalog - Guembelina semicostata Catalog - Guembelina semicostata

CATALOG OF ORIGINAL DESCRIPTIONS: Guembelina semicostata 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 semicostata
Other pages this level: << < G. obtusa, G. ototara, G. papula, G. paucistriata, G. plana, G. planata, G. plummerae, G. pseudostriata, G. pseudotessera, G. pulchra, G. pumilia, G. punctulata, G. reussi, G. santonica, G. santonica pseudoobtusa, G. semicostata, G. spinifera, G. striata compressa, G. striata deformis, G. subplummerae, G. tenuis, G. trinitatensis, G. turonica, G. ultimatumida, G. venezuelana, G. venezuelana rugosa, G. ventilabrelliformis, G. washitensis, G. wilcoxensis

Guembelina semicostata

Citation: Guembelina semicostata Cushman 1938
taxonomic rank: Species
Type specimens: Pl. 3 fig.6; 24386
Type sample (& lithostrat): lower 'beds of the upper part of the Taylor marl
Type age (chronostrat): Maastrichtian
Type locality: Road cut, east bank, near creat of hill, 14.4 mi. south of Paris, 0.9 mi. north of Lake City, Delta County, TX
Type repository: Washington; USNM

Linked specimens: USNM-31508 USNM-31510 USNM-24386 USNM-31507 USNM-31509

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


Original Description

Test about 1½ times as long as broad, compressed, gradually tapering, less rapidly in the later portion, early portion slightly keeled, later portion with the periphery slightly indentate, initial end acute; chambers with the faces flattened but broadly rounded at the periphery, broader than high throughout; sutures broadly limbate, slightly if at all depressed, curved; wall in the middle and inner portions smooth, rounded, arched opening with a thickened, rounded lip.

Size:
Length 0.35 mm.; breadth 0.20 mm.; thickness 0.10 mm.

Extra details from original publication
This species differs from G. striata in the strongly limbate costae, well developed, curved costae at the outer side of the chambers and compressed test. It is one of the most striking species of the genus, and its range seems to be confined to the upper part of the Taylor marl. It should be an excellent index fossil for this part of the section.

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 semicostata compiled by the pforams@mikrotax project team viewed: 20-6-2024

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