CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana arca var. esnehensis 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 arca esnehensis
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, G. bollii, G. bulloides naussi, G. calcarata, G. calcarata arcata, G. calcarata primitiva, G. calcarata retardata, G. caliciformis sarmientoi, G. caliciformis trinidadensis> >>

Globotruncana arca esnehensis

Citation: Globotruncana arca var. esnehensis Nakkady 1950
Rank: variety
Type locality: Southeast of the Nile of Esna, Esna-Idfu region, Upper Egypt.
Type age (chronostrat): lower Maastrichtian
Type sample (& lithostrat): sample Dar. 295, the basal sample of the shales at Abu Durba.
Type specimens: Plate 90, figures 23-26; P45527
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (45527)

Current identification/main database link: Globotruncana esnehensis Nakkady 1950


Original Description
This variety has the dorsal side more convex than the ventral in most specimens but some which are more or less equally biconvex obviously link it to the typical form. It is somewhat similar to G. conica White, but has fewer whorls and chambers and the sutures on the dorsal side are more curved. Some specimens which have a conspicuously large last chamber are very similar to G. convexa Sandidge, but they lack the secondary keel.

Size: Diameter, 0.50 mm., thickness, 0.30 mm.

Extra details from original publication
This variety is frequent in the Globotruncana-Guembelina zone of the Abu Durba and Mellaha sections and floods 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 arca esnehensis compiled by the pforams@mikrotax project team viewed: 30-7-2021

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Comments (1)

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Le Coze

The original name is Globotruncana arca var. esnehensis Nakkady, 1950

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Jeremy Young (UK)

corrected now, thanks Jeremy

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