Catalog - Globigerina (Eoglobigerina) hemisphaerica Catalog - Globigerina (Eoglobigerina) hemisphaerica

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina (Eoglobigerina) hemisphaerica Morozova 1961

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 -> Globigerina (Eoglobigerina) -> Globigerina (Eoglobigerina) hemisphaerica
Other pages this level: G. (Eoglobigerina) balakhmatovae, G. (Eoglobigerina) bizkaiensis, G. (Eoglobigerina) eobulloides, G. (Eoglobigerina) hemisphaerica, G. (Eoglobigerina) pentagona, G. (Eoglobigerina) prebetica, G. (Eoglobigerina) taurica, G. (Eoglobigerina) tetragona, G. (Eoglobigerina) theodosica, G. (Eoglobigerina) trifolia

Globigerina (Eoglobigerina) hemisphaerica

Citation: Globigerina (Eoglobigerina) hemisphaerica Morozova 1961
taxonomic rank: Species
Type specimens: holotype (fig. 4a-c) 3510/3.
Type sample (& lithostrat): in a clayey marl. More than one thousand specimens.
Type age (chronostrat): Lower Danian (Uylin substage), corresponding to the lower part of the Globigerina stage of Western European authors, Dn 1 II Zone (Globigerina microcellulosa Zone); Ranges from the upper part of the underlying Dn II Zone (Globigerina (Eoglobigerina) taurica Zone) to the roof of the Dn 1 II Zone.
Type locality: Tarkhankhut Peninsula, eastern Crimea, southern Russia. Also found in the Caucasus.
Type repository: Moscow, Inst. of Geol. Sci. of the Academy of Sciences

Current identification/main database link: Eoglobigerina edita (Subbotina 1953)


Original Description

Translation from the Russian. - Test highly trochoid. Equatorial peripheral margjn scalloped, ax ial margin broadly rounded. Spiral side strongly convex, umbilical side flattened with a deep narrow umbilicus. Spire consists of three whorls, freely lying one above the other. First whorl low, closely adjoining the second one. Second whorl high, lies on top of the nex t one, forming a distinct st ep in profile. ln each whorl are 4½ to 5½ inflated subspheroidal chambers. In the first whorl the chambers quickly increase in size and are arranged quite closely, in the second and last ones, their increase is slower, and the arrangement freer. Sutures deep, especially the spiral suture between the second and last whorls. Aperture slit-shaped, semicircular, locat ed between the umbilicus and the outer margin. Wall smooth, finely perforate. Surface lustrous or matte.  

Size:
Greatest diameter 0.30, least diameter 0.27, height 0.20 mm.

Extra details from original publication
Variability. - The number of chambers per whorl (4½-5½) is not constant, but the tests with 5 or 4½ chambers are rarer. The height of the whorls also is variable.
Comparison - The peculiar stepped joining of the next-to-the-last whorl with the last one distinguishes the species described from close smooth-walled globigerinas, possessing four and a half to five chambers in the last whorl: Globigerina cretacea d'Orbigny, G. edita Subbotina, and G. (Eoglobigerina) theodosica Morozova.

References:

Morozova, V. G. (1961). Datsko-Montskie planktonnye foraminifery yuga SSSR [Danian-Montian Planktonic Foraminifera of the Southern USSR]. Paleontologicheskiy Zhurnal. 8-19. gs O

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs


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Globigerina (Eoglobigerina) hemisphaerica compiled by the pforams@mikrotax project team viewed: 2-3-2024

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