Ouda 1998 pl3 f1 & 4.JPG
Ouda 1998 pl3 f2-3.JPG
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Ouda 1998 pl3 f1 & 4.JPG
Ouda 1998 pl3 f2-3.JPGCurrent 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).
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. gsReferences:
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Globigerinoides altiaperturus praealtiaperturus compiled by the pforams@mikrotax project team viewed: 18-9-2021
Short stable page link: https://mikrotax.org/pforams/index.php?id=130820 Go to Archive.is to create a permanent copy of this page - citation notes |
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