Catalog - Planoglobulina brazoensis

CATALOG OF ORIGINAL DESCRIPTIONS: Planoglobulina brazoensis Martin 1972

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 -> P -> Planoglobulina -> Planoglobulina brazoensis
Other pages this level: P. brazoensis, P. meyerhoffi, P. taylorana, P. transcaucasica

Planoglobulina brazoensis

Citation: Planoglobulina brazoensis Martin 1972
Rank: Species
Described on page(s) : 81-83
Type specimens: pl4 f4-7; 170324
Type age (chronostrat): Maastrichtian
Type locality: from 18 feet above the base of an exposure on the south bank of Walter Creek, 6 mi. N15E of Cameron, Milam County, TX
Type repository: Washington; USNM

Linked specimens: USNM-170326 USNM-170324 USNM-170325 USNM-170327

Current identification/main database link: Planoglobulina brazoensis Martin 1972


Original Description

Test flabelliform, inflated, especially in early portion. Six rapidly expanding chambers in biserial portion; 10 inflated, globular chambers in multiserial portion. Sutures fairly distinct, depressed. Coarse, discontinuous, longitudinal costae over entire test, separated by 2 or more rows of randomly arranged pores; costae somewhat finer on last row of chambers. Arched, basal apertures on front and back of all but outermost chambers in the last row; outermost chambers with apertures on front only, facing inward.

Size:
Holotype measures 525µm in length, 475µm in width, and 275µm in maximum thickness. Other specimens vary from 500 to 550µm, in length; 450 to 525µm in width; and 250 to 300µm maximum thickness.

Etymology:

Extra details from original publication
Remarks: P. brazoensis, n. sp., differs from P. acervulinoides (Egger), in its less symmetrical, more inflated test, narrower costae, and fewer number of chambers (15 to 18).

Range: G. contusa-stuartiformis Assemblage Zone, uppermost G. gansseri Subzone to A. mayaroensis Subzone.

Occurrence: In Texas P. brazoensis, n. sp., occurs in the late Maestrichtian (uppermost G . gamseri Subzone) Kemp Clay of Falls and Milam counties (TX 267  of Pessagno; TX 9AH of Smith, see appendix).
In Mexico P. brazoensis, n. sp., is abundant in the late Maestrichtian portion of the Papagallos Shale (MX 174 of Pessagno, see appendix).
The specimen figured by Berggren (1962, pl. VI, fig.6) from the late Maestrichtian of southern Scandinavia is Planoglobulina brazoensis Martin, n. sp., not Pseudotextularia (Racemiguembelina) fructicosa (Egger), R. fructicosa is conical in shape and has coverplates, with accessory apertures, which extend over the last few series of circumferentially arranged chambers (see plate 4, fig. 3c).

Editors' Notes

References:

Martin, S. E. (1972). Reexamination of the Upper Cretaceous planktonic foraminifera genera Planoglobulina and Ventilabrella Cushman. Journal of Foraminiferal Research. 2(2): 73-92. gs


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Planoglobulina brazoensis compiled by the pforams@mikrotax project team viewed: 6-7-2022

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