Catalog - Globorotalia kilabiyaensis Catalog - Globorotalia kilabiyaensis

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia kilabiyaensis El-Naggar 1966

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 -> Globorotalia -> Globorotalia kilabiyaensis
Other pages this level: << < G. hispidicidaris, G. humerosa, G. hungarica, G. ikebei, G. imitata, G. inconspicua, G. inconspicua aculeata, G. inflata, G. inflata praeinflata, G. inflata triangula, G. insolita, G. involuta, G. irrorata, G. juanai, G. kajmatica, G. kilabiyaensis, G. kingmai, G. kolchidica, G. kotucensis, G. kugleri, G. lacerti, G. laeta, G. lehneri, G. lenguaensis, G. lensiformis, G. lensiformis carpatica, G. lenticularis, G. limbata conferta, G. limbata consutila, G. limbata latiumbilicata, G. limbata oregope> >>

Globorotalia kilabiyaensis

Citation: Globorotalia kilabiyaensis El-Naggar 1966
Taxonomic rank: species
Type specimens: holotype (fig. 4a-c) P.45613; unfigured paratypes. P.45614.
Type sample (& lithostrat): Owaina Formation, just above the disconformity separating the upper Maestrichtian and the upper Danian. Abundant to rare.
Type age (chronostrat): Lower Paleocene, upper Danian
Type locality: Holotype (fig. 4a-c) and unfigured paratypes from approximately 14.5 meters above the base of the Gebel El-Kilabiya section ( 25° 15'N 32°38.75'E), about 9.8 km. southeast of the Nile at Esna, Esna-Idfu region, Upper Egypt.
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (45614) London, UK; NHM (PM P 45613)

Current identification:


Original Description

Diagnosis. - A Globorotalia with concavo-convex, compressed test; lenticular, chambers which increase rapidly in size; radial, depressed sutures; wide umbilicus and almost perfectly smooth surface.

Description. - Test medium-sized, concavo-convex, strongly compressed, coiled in a very low trochospire: dorsal side slightly convex, ventral side concave; equatorial per iphery roughly ovoid, slightly elongate, moderately lobate; axial periphery subrounded, compressed; chamber on the dorsal side 13, arranged in 2 sinistrally coiled whorls; the initialones are small, globigerine, compressed and increase slowly in size; the last whorl is composed of 4½, roughly lenticular, slightly compressed chambers which increase rapidly in size; on the ventral side the chambers are 4½, roughly lenticular and increase rapidly in size; sutures on the dorsal sid e curved, depressed in the early part, almost straight, depressed later: on the ventral side they are straight, radial and strongly depressed; umbilicus large, shallow and open; aperture interiomarginal, extraumbilical-umbilical covered with a prominent, flaring lip; wall calcareous, perforate; surface perfectly smooth with few, small, delicate papillae on the ventral side of the early chambers.

Size:
Maximum diameter 0.300 mm.; minimum diameter 0.225 mm.; thickness 0.100 mm.

Extra details from original publication
Remarks. - Globorotalia kilabiyaensis El-Naggar is distinguished from G. compressa (Plummer) by its distinctly concavo-convex test, much wider umbilicus and delicately papillose surface. The form described as G. compressa by Loeblich and Tappan (1957, pl. 44, fig. 9a-c) shows a slightly concave ventral side and may be transitional between G. compressa and G. kilabiyaensis.

References:

El-Naggar, Z. R. (1966). Stratigraphy and planktonic foraminifera of the Upper Cretaceous-Lower Tertiary succession in the Esna-Idfu region, Nile Valley, Egypt, U. A. R. Bulletin of the British Museum (Natural History). supplement 2: 1-291. gs

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 173-198. gs


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Globorotalia kilabiyaensis compiled by the pforams@mikrotax project team viewed: 13-8-2026

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