CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia berggreni El Naggar 1966
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Citation: Globorotalia berggreni El Naggar 1966taxonomic rank: SpeciesType specimens: holotype (fig. 7a-c) P.45597; unfigured paratype. P.45598.Type sample (& lithostrat): upper Owaina Shale. Rare.Type age (chronostrat): Upper Paleocene, Globorotalia aequa/Globorotalia esnaensis Subzone of the Globorotalia velascoensis ZoneType locality: Holotype ( fig. 7a-c) and one unfigured paratype from approximately 160 meters above the base of the Gebel Owaina section (27°45'N 32°45.75'E), about 12 km. north of the Nile at El Mahamid. Esna-Idfu region, Upper Egypt.Type repository: London, UK; NHM
Original Description "Diagnosis.- A Globorotalia with roughly triglobular, compressed, umbilico-convex test; extremely reduced umbilicus; log, slit-like aperture and heavily spinose surface. " Description.- Test medium sized, compressed and coiled in a low trochospire; dorsal side almost flat, but weakly inflated with the chambers slightly compressed towards the periphery; ventral side strongly inflated; equatorial periphery roughly triglobular, distinctly lobate and sharply serrate, without a marginal keel; axial periphery subrounded or rather blunty angular due to the slight compression of the chambers towards the periphery; chambers on the dorsal side are not all clear but appear to be 11 in number, arranged in 2 dextrally coiled whorls; the initial chambers are small, indistinct, and almost masked by the surface rugosity; the last whorl is composed of 3½ large subglobular, compressed chambers which increase slowly in size except for the last one wich is slightly smaller than the penultimate; on the ventral side the chambers are 3½ subglobular and strongly inflated; sutures on the dorsal side short, curved and strongly depressed; on the ventral side the sutures are radial and strongly incised; umbilicus reduced to an extremely narrow central pit from which the aperture starts and the ventral sutures radiate; aperture interiomarginal extraumbilical-umbilicar, a large, crescentic arch extending almost to the periphery; wall calcareous, perforate; surface rough, heavily nodose, with the nodes tapering out in the form of stout spine-like projections, especially along the periphery. Size: Maximum diameter 0.39 mm.; minimum diameter 0.34 mm.; thickness 0.26 mm. Extra details from original publication
Remarks. - Globorotalia berggreni El-Naggar differs from G. esnaensis (Le Roy) [Globigerina esnaensis, 1953] in its compressed test, smaller size, fewer chambers in the last whorl, subrounded to subacute axial periphery, much narrower umbilicus and peculiar aperture. The form described by Berggren (1960) as G. esnaensis (Le Roy) is different from Le Roy's original description and figures, but may probably belong to the present species, although it has more chambers. a more rounded axial periphery and a more umbilical aperture. Globorotalia berggreni probably evolved from G. imorata Loeblich and Tappan by the development of a more tightly coiled, compressed test, a more spinose surface. a much narrower umbilicus and a long slit-like aperture. On the other hand, it might possibly have evolved from esnaensis (Le Roy) by the reduction in size of test, its slight compression, and by the development of the very narrow umbilicus and the long, slit-like aperture."
" Editors' Notes content migrated from chronos
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
Globorotalia berggreni compiled by the pforams@mikrotax project teamviewed: 9-9-2024
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holotype illus_774.jpg
holotype illus_774.jpg
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