Catalog - Globigerina (Eoglobigerina) tetragona Catalog - Globigerina (Eoglobigerina) tetragona

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina (Eoglobigerina) tetragona 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) tetragona
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) tetragona

Citation: Globigerina (Eoglobigerina) tetragona Morozova 1961
taxonomic rank: Species
Type specimens: holotype (fig. 2a-c) 3510/5.
Type sample (& lithostrat): in a light gray clayey marl
Type age (chronostrat): Lower Danian (Uylin substage), corresponding to the lower part of the Globigerina stage of Western European authors, Dn1 I Zone (Globigerina (Eoglobigerina) taurica Zone); . Also occurs in the overlying Dn1 II Zone (G. microcellulosa Zone) (upper lower Danian). Massive number of specimens.
Type locality: Novouzensk, cis-Caspian Basin, USSR. Also found in the Crimea and 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 subquadrate, formed in a high spiral, consisting of two to two and a half whorls. Each whorl consists of four inflated, slowly enlarging chambers. Spiral side conical, umbilical side concave in the center. Umbilicus narrow. Sutures deep. Aperture umbilical with a slit-shaped prolongation along the marginal suture. Wall smooth, finely perforate. Surface lustrous.

Size:
Greatest diameter 0.32, least diameter 0.26, height 0.24 mm.

Extra details from original publication
Variability. - Variable features are the height of the spire and the number of chambers per whorl. In the populations four-chambered forms predominate, in which the height of the test is almost equal to its diameter, but less high specimens are also encountered. The number of chambers varies from four to four and a half.
Comparison. - The given species in relative height of the test and number of chambers in the whorls occupies an intermediate position between Globigerina (Eoglobigerina) trifolia Morozova and G. (Eoglobigerina) pentagona Morozova, with both of which it is connected by intermediate forms. The basic distinguishing feature of the described species is its four-chambered whorls and the relatively high spire, the height of which is only a bit less than the diameter. From G. (Eoglobigerina) quadrata White it differs by the conical spiral side and evolute whorls.

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) tetragona compiled by the pforams@mikrotax project team viewed: 23-4-2024

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