Catalog - Chiloguembelina midwayensis strombiformis

CATALOG OF ORIGINAL DESCRIPTIONS: Chiloguembelina midwayensis strombiformis 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 midwayensis strombiformis
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 midwayensis strombiformis

Citation: Chiloguembelina midwayensis strombiformis Beckmann, 1957
Rank: sub-species
Type specimens: P5771 Plate 21, Figuke 6; Text-figure 14 (28-31); Figured holotype (USNM P5771) and paratypes (USNM P5772 a-d), unfigured paratypes (USNMP5773).
Type sample (& lithostrat): lower Lizard Springs formation; core 3720-40 feet (TTOC 223472),
Type age (chronostrat): Paleocene, Globorotalia pseudomenardii zone
Type locality: Trinidad Petroleum Development Co. well Moruga No. 15, south Trinidad (coordinates N: 149878 links, E: 497002 linlu),
Type repository: Washington; USNM

Linked specimens: USNM-5772 USNM-5772 USNM-5772 USNM-5772 USNM-5771

Current identification/main database link: Chiloguembelina midwayensis (Cushman 1940)


Original Description

Test rapidly increasing in breadth, slightly compressed laterally. Periphery roimded. Chambers shghtly inflated, biserially arranged, with their apertural faces not at right angles to the plane of greatest breadth of the test, thus giving the test a twisted appearance. Sutures depressed, slanting. Wall finely spinose. Aperture large, broader than high, surrounded by a transparent collar. One side of the aperture projects more than the other; its position is therefore oblique with regard to the general shape of the test.

Size:
Length: 0.23-0.3 mm.; holotype, 0.25 mm.

Etymology:

Extra details from original publication
Remarks: The variability of Chiloguembelina midwayensis strombiformis is illustrated by the text-figures 14, numbers 28-31. It increases more rapidly in size than Chiloguembelina midwayensis midwayensis and has a more spinose wall, more oblique sutures and a broader aperture. It is separated from Chiloguembelina crinita (Glaessner) by the lower, less globular chambers, the slightly coarser spinosity of the wall and the broader aperture.

Occurrence: Lower Lizard Springs formation (Paleocene), Globorotalia pseudomenardii zone (common) and Globorotalia velascoensis zone (rare)

Editors' Notes

References:

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


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

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