Catalog - Hastigerina primitiva

CATALOG OF ORIGINAL DESCRIPTIONS: Hastigerina primitiva El-Shinnawi 1975

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 -> H -> Hastigerina -> Hastigerina primitiva
Other pages this level: H. aspera digitata, H. digitata, H. eocenica, H. klampisensis, H. murrayi, H. parapelagica, H. primitiva

Hastigerina primitiva

Citation: Hastigerina primitiva El-Shinnawi 1975
Rank: Species
Type specimens: pl. 1, fig. la-c. holotype, umbilical, peripheral, and spiral views, X 100. :
Type age (chronostrat): Lower Miocene
Type locality: Depth interval of 1447-1464 ft., core no. 32, Hurgada well no. 134, Hurgada oilfield, Red Sea coast of Egypt.
Type repository: Alexandria; Geology Department, Faculty of Science, Alexandria University, Alexandria, Egypt.

Current identification:


Original Description

"Test free. relatively small; early stage slightly trochospiral, adult stage tending to uncoil. becoming slightly evolute with chambers nearly, but imperfectly. planispiral; umbilicus narrow on ventral side, very shallow on spiral side; equatorial periphery trapezoid in outline, lobulate; axial periphery rounded. Chamber globular. becoming subglobular in adult stage, arranged in about 3 whorls. early chambers very small, the 5 chambers of the last whorl increase rapidly in size. Sutures distinct, curved, depressed. Wall calcareous, perforate. finely pitted. Aperture interiomarginal, umbilical-extraumbilical, crescentic bordered with a lip.

Size:
Maximum diameter of holotype 0.28 mm.

Etymology:

Extra details from original publication
"Remarks. - In spite of the imperfect planispiral arrangement of the chambers in the last whorl of the test of this described type and the umbilical-extraumbilical, but non-equatorial position of its aperture, yet it is more related to the genus Hastigerina Thomson rather than to GloborotaLoides Bolli. The latter genus does not show any tendency of planispirality. This described new type is regarded as a primitive species of Hastigerina which had not attained the stage of the perfect planispiral arrangement of its chambers and the equatorial position of the aperture. These characters distinguish Hastigerina primitiva El-Shinnawi from the other known allied species."

Editors' Notes

References:

El-Shinnawi, M. A. (1975). Planktonic foraminifera from the Miocene Globigerina marl of Hurgada well-134, Eastern Desert, Egypt. Empresa Nacional Adaro de Investigaciones (ENAdI) Mineras, Addis Ababa.. 199-224. gs


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Hastigerina primitiva compiled by the pforams@mikrotax project team viewed: 5-10-2022

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