CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia woodi 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 woodi
Other pages this level: << < G. traubi, G. tribulosa, G. trichotrocha, G. trinidadensis, G. troelseni, G. truncatulinoides excelsa, G. uncinata, G. uncinata carinata, G. ungulata, G. velascoensis parva, G. wartsteinensis, G. whitei, G. wilcoxensis, G. wilcoxensis acuta, G. wilesi, G. woodi, G. youngi, G. zealandica, G. zealandica incognita, G. zealandica pseudomiozea,

Globorotalia woodi

Citation: Globorotalia woodi El-Naggar 1966
Rank: Species
Type locality: Holotype (fig. 2a-c) and unfigured paratypes from approximately 125.5 meters above the base of the Gebel Owaina section (27°45 1N 32°45.75'E), about 12 km. north of the Nile at EI-Mahamid, Esna-Idfu region, Upper Egypt.
Type age: Upper Paleocene, Globorotolia velascoensis Zone
Type sample and level: lower Owina Shale.
Holotype Repository: London, UK; NHM
Type & figured specimens: holotype (fig. 2a-c) P.45616; unfigured paratype, P.45671.

Linked specimens: London, UK; NHM (45671) London, UK; NHM (PM P 45616)

Current identification/main database link:


Original Description

Diagnosis
: A Globorotalia with small, umbilico-convex test; chambers which increase rapidly in size; narrow umbilicus; long, narrow aperture; curved, depressed dorsal sutures and slightly curved, incised ventralones; delicate but distinct marginal keel; delicately papillose surface.
Description:  Test small, umbilico-convex, coiled in a low trochospire; dorsal side almost flat, although the early chambers are slightly raised; ventral side distinctly protruding; equatorial periphery ovoid, elongate, slightly lobate with a delicately beaded marginal keel; axial periphery angular, acute; chambers on the dorsal side are not all clear because of the surface rugosity, but appear to be 11 in number, arranged in 2 sinistrally coiled whorls; the last whorl is composed of 5 relatively large crescentic chambers, which increase rapidly in size; on the ventral side, the chambers are 5, roughly triangular, angular conical, increasing rapidly in size; sutures on the dorsal side curved, delicately beaded, and slightly depressed; on the ventral side they are slightly curved and strongly depressed; umbilicus extremely small, moderately deep andopen; aperture interiomarginal, extra umbilical-umbilical, a long, narrow arch, with a narrow delicate lip; wall calcareous perforate; surface rough papillose, with the roughness decreasing gradually towards the last chamber.

Size: maximum diameter 0.27 mm.: minimum diameter 0.21 mm. : thickness 0.15 mm.

Extra details from original publication
Remarks. - Globorotalia woodi El-Naggar is morphologically similar to both Globorotalia planoconica Subbotina and Globorotalia pseudoscitula var. elongata Glaessner. It differs from the former in having a slightly larger test, more protruding ventral side, slightly curved ventral sutures, well-developed marginal keel, and rough surface. It is distinguished from G. pseudoscitula var. elongata Glaessner by its well developed marginal keel, sharply angular axial periphery and rough surface.
Globorotalia woodi is believed to have evolved from G. emilei El-Naggar either directly or indirectly through its descendant G. pseudomenardii Bolh by flattening of the dorsal side and greater protrusion of the ventral, and by the development of a more tightly coiled test, rough surface and a delicately beaded keel.

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) Geology. supplement 2: 1-291. gs


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Globorotalia woodi compiled by the pforams@mikrotax project team viewed: 21-9-2020

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