Catalog - Chiloguembelina subtriangularis

CATALOG OF ORIGINAL DESCRIPTIONS: Chiloguembelina subtriangularis Beckmann 1957

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 -> C -> Chiloguembelina -> Chiloguembelina subtriangularis
Other pages this level: C. adriatica, C. andreae, C. circumlabiata, C. fusiformis, C. midwayensis strombiformis, C. midwayensis subcylindrica, C. minutissima, C. noguerensis, C. orientalis, C. parallela, C. praecursor, C. subtriangularis, C. subwilcoxensis, C. taurica, C. ujliaensis, C. victoriana, C. vineetae, C. waiparaensis, C. woodi

Chiloguembelina subtriangularis

Citation: Chiloguembelina subtriangularis Beckmann 1957
Rank: Species
Type specimens: Figured holotype (USNM P5783) and paratypes (USNM P5784a-d), unfigured paratypes (USNM P5785).
Type age (chronostrat): Paleocene, Globorotalia pusilla pusilla Zone
Type locality: Holotype from the Paleocene, lower Lizard Springs formation, Globorotalia 'pusilla pusilla zone. Locality: TTOC well Guayaguayare No. 159, southeast Trinidad (coordinates N:151361 links, E:554095 links), core 4778-90 feet (TTOC 232706).
Type repository: Washington; USNM

Linked specimens: USNM-5784 USNM-5784 USNM-5783 USNM-5784 USNM-5784

Current identification/main database link: Chiloguembelina subtriangularis Beckmann 1957

Original Description

Test small, subtriangular, pointed at the base, compressed, with a subangular periphery. Chambers biserial, very slightly inflated. Sutures nearly horizontal, slightly depressed, at least in the later stages. Wall smooth. Aperture commonly slightly eccentric, semicircular to subquadrangular, may have a slight collar.

Length: 0.14-0.22 mm.; holotype, 0.21mm.


Extra details from original publication
The compressed, subtriangular test makes it easy to distinguish Chiloguembelina subtriangularis , new species, from other Chiloguembelina species. The variability is shown in the text-figure but the extreme forms (Nos. 39 and 42) are rare. C. subtriangularis occurs in all zones of the lower Lizard Springs formation, but is most common in the Globorotalia pusilla pusilla zone. The specimens from the Globorotalia trinidadensis zone have a more rounded periphery, slightly curved sutures and resemble compressed specimens of C. midwayensis midwayensis.

Editors' Notes


Beckmann, J. P. (1957). Chiloguembelina Loeblich and Tappan and related foraminifera from the Lower Tertiay of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 83-95. gs V O

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


Chiloguembelina subtriangularis compiled by the pforams@mikrotax project team viewed: 30-11-2022

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