CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana aegyptiaca duwi Nakkady 1950

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 -> Globotruncana -> Globotruncana aegyptiaca duwi
Other pages this level: G. adamsi, G. aegyptiaca, G. aegyptiaca duwi, G. alpina, G. andori, G. ansarii, G. appenninica, G. arabica, G. araratica, G. arca caribica, G. arca esnehensis, G. arcaformis, G. aspera, G. asymetrica, G. atlantica, G. aturica, G. azerbaidjanica, G. bahijae> >>

Globotruncana aegyptiaca duwi

Citation: Globotruncana aegyptiaca duwi Nakkady 1950
Rank: sub-species
Type sample (& lithostrat): sample T 2324 of the Gebel Duwi Chalk.
Type specimens: Plate 90, figures 17-19

Current identification/main database link: Globotruncana aegyptiaca Nakkady 1950


Original Description
The last chamber constitutes about half of the test. Only three chambers are usually visible from the ventral side. The first chamber of the last whorl is usually much smaller than the others which follow, and this has affected the general shape of the test and the arrangement of the chambers so that the suture between the second and third chambers in the last whorl is in the middle of the sides of the test. Sutures much curved. Periphery sharp as in the typical form and sometimes double keeled as shown in figure 18.

Size: Length, 0.30 mm.; breadth, 0.25 mm.; thickness, 0.15 mm.

Extra details from original publication
This variety is related to the typical form in the same manner as Globorotalia crassata var. aequa is related to Globorotalia colligera. It probably is the ancestor of Globorotalia crassata var. aequa which is very similar and appears in higher stratigraphic zones. The Globotruncana variety is distinguished by the double keel, the dorsally beaded suture the wide umbilicus, and the shape and position of the ventral aperture.
Rather frequent in the Chalk at Gebel Duwi.

References:

Nakkady, S. E. (1950). A new foraminiferal fauna from the Esna shales and Upper Cretaceous chalk of Egypt. Journal of Paleontology. 24(6): 675-692. gs


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Globotruncana aegyptiaca duwi compiled by the pforams@mikrotax project team viewed: 30-7-2021

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