CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides altiaperturus praealtiaperturus Ouda 1998

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 -> G -> Globigerinoides -> Globigerinoides altiaperturus praealtiaperturus
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Globigerinoides altiaperturus praealtiaperturus

Citation: Globigerinoides altiaperturus praealtiaperturus Ouda 1998
Rank: sub-species
Type locality: Khalda SD-1, N. Western Desert, depth 1870-1800 feet
Type age (chronostrat): Late Oligocene
Type specimens: Pl. I, Figs. 4-12 B; Pl. III, Figs. 1-4
Described on page(s) : 19-20

Current identification:


Original Description
Globigerinoides praealtiaperturus develops from Globigerina praebulloides praebulloides by the acquisition of a single sutural supplementary aperture on the dorsal side of the adult test. It differs from Gs. primordius in possessing a looser mode of coiling, a wider umbilicus, better separated and less embracing chambers, and a more open and higher arched aperture. This subspecies seems to be the immediate precursor of Gs. altiaperturus which appears during the Early Miocene in other sections of the northern Western Desert (Ouda,1998a). The latter form is distinguished by the rapid increase in size of the last formed chambers , the tightness of the coiling mode, the narrowness of the umbilicus and the presence of additional supplementary apertures on the dorsal side of the earlier part of the test.

Extra details from original publication
Observed stratigraphic range: Late Oligocene, corresponding to Zone P22 as redefined by Berggren & Miller (1988).

References:

Ouda, K. (1998). Primitive Globigerinoides in the Late Oligocene of the Northern Western Desert, Egypt: a contribution to the orgin and evolution of the genus Globigerinoides. Bulletin of Faculty of Science, Assiut University. 27: 13-40. gs


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Globigerinoides altiaperturus praealtiaperturus compiled by the pforams@mikrotax project team viewed: 21-4-2021

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