Catalog - Hastigerinella (Hastigerinoides) rohri

CATALOG OF ORIGINAL DESCRIPTIONS: Hastigerinella (Hastigerinoides) rohri Bronnimann 1952

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.


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Hastigerinella (Hastigerinoides) rohri

Citation: Hastigerinella (Hastigerinoides) rohri Bronnimann 1952
Rank: Species
Type specimens: Holotype:T.L.L.Cat.Nos.144455,168920.Plate 1,figs.8,9.
Type sample (& lithostrat): Gautier formation
Type age (chronostrat): Globotruncana apenninica zone
Type locality: Trinidad,B.W.I.
Type repository: USNM

Current identification/main database link: Schackoina cenomana (Schacko, 1897)


Original Description

The small and regularly stellate test is planispiral and semi-involute in the adult. It is possible that the early chambers are arranged in a weak trochoidal spiral. The 5 elongate chambers of the adult only slightly increase in size during growth, and not much difference exists between the dimensions of the first and the last chamber of the final volution. The chambers are bulbose at the base and tapering more or less gradually into pointed ends, which as a rule are broken off. The regular stellate arrangement of the adult is a remarkable feature of this species. Deformations of the test are rather common. The shallow umbilici are usually filled with matrix. Traces of subglobular earlier chambers can occasionally be seen. The straight sutures are well defined and not much depressed. The aperture was not clearly seen; it appears to be a low arcuate opening at the base of the end chamber. The walls are thin and finely perforate. The surface is smooth.

Size:
The maximum diameter of the paratypes including the elongate chambers varies from 0.2mm.to 0.25mm.
Holotype: Maximum diameter 0.275mm. Basal thickness of end chamber O.075mm. Thickness of spine 0.030mm. Radial length of average chamber 0.075mm.

Etymology:
This species is named for Dr. K. Rohr in recognition of his outstanding contributions to the geology of Trinidad.

Extra details from original publication
Remarks: This delicate species apparently is a forerunner of Hastigerinoides alexanderi (Cushman), from which it differs by the smaller test and by the regular stellate arrangement of the more or less equal-sized and less elongate adult chambers.

OccurrenceGlobotruncana apenninica zone, Gautier formation. Upper Cretaceous. Rare.

Editors' Notes

References:

Brönnimann, P. (1952c). Globigerinidae from the Upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B. W. I. Bulletins of American Paleontology. 34(140): 1-70. gs


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Hastigerinella (Hastigerinoides) rohri compiled by the pforams@mikrotax project team viewed: 30-11-2022

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