CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana aegyptiaca 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
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> >>

Globotruncana aegyptiaca

Citation: Globotruncana aegyptiaca Nakkady 1950
Rank: Species
Type locality: Anglo-Egyptian Oilfields Ltd. Sample Dar. 290, from Abu Durba, in western Sinai about 174 km southeast of Suez, Egypt
Type age (chronostrat): not given
Type sample (& lithostrat): Sample Dar. 290
Type specimens: Plate 90, figures 20-22
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (PM P 41777) London, UK; NHM (PM P 41773)

Current identification/main database link: Globotruncana aegyptiaca Nakkady 1950


Original Description
"Test planoconvex, dorsal side always flat, ventral side convex. Periphery acute, lobulate, single keeled in most specimens but occasionally with a double keel, sometimes spinose. Chambers, particuarly the last ones, petalid, four in the last whorl. Sutures distinct, radial depressed ventrally; beaded, raised, strongly curved dorsally. Aperture ventral, large, arched, at base of last chamber, opening into wide umbilicus. Wall finely perforate.

Size: Measurements of holotype: Length 0.50 mm; thickness 0.20 mm

Extra details from original publication
This species is a very close ally to G. cretacea Cushman from which it differs by the more petalloid shape and fewer chambers. G. aegyptiaca is distinguished from Globorotalia colligera (Schwager), which is probably its direct descendent, by the raised and beaded dorsal sutures, the aperture, and the wide ventral umbilicus. In all other respects they are very much alike.

Rare to abundant in the first two Chalk samples of Wadi Mellaha and in the basal shale samples of Abu Durba and Wadi Danili; frequent to abundant in the Chalk of 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 compiled by the pforams@mikrotax project team viewed: 30-7-2021

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