Catalog - Globigerina (Eoglobigerina) trifolia Catalog - Globigerina (Eoglobigerina) trifolia

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

Citation: Globigerina (Eoglobigerina) trifolia Morozova 1961
taxonomic rank: species
Type specimens: holotype (fig. 1 a-c) 3510/4.
Type sample (& lithostrat): in a gray clayey marl.
Type age (chronostrat): Lower Danian (Uylin substage), corresponding to the lower part of the Globigerina stage of Western European authors, Dn 1 I Zone (Globigerina (Eoglobigerina) taurica Zone); Also occurs in the overlying Dn 1 II Zone (G. microcellulosa Zone) (upper lower Danian). Massive number of specimens.
Type locality: Tarkhankhut Peninsula, eastern Crimea, southern Russia. Also occurs in the Caucasus and on the Russian Platform.
Type repository: Moscow, Inst. of Geol. Sci. of the Academy of Sciences

Current identification/main database link: Globoconusa daubjergensis (Bronnimann 1953)


Original Description

Translation from the Russian. - Test highly trochoid, with a subtriangular lateral outline. Spiral side high, conical, umbilical side flattened or concave in the center, with a narrow deep umbilicus. Spire formed hy two to two and a half whorls, freely lying one on top of the other. In the last whorl are three to three and a half in flated subspherical chambers. In the early whorls of microspheric forms there are five chambers. Sutures deep. Aperture semicircular around the umbilicus, often with a slit-shaped prolongation from the umbilicus to the outer margin. Wall smooth, finely perforate. Surface lustrous or matte.  

Size:
Greatest diameter 0.25, least diameter 0.24, height 0.21 mm.

Extra details from original publication
Variability. - The number of chambers in a whorl (3 -3.5) and the height of the spire are not constant; in three-chambered tests the spire is high, and in tests with three and a half chambers it is lower. Three-chambered forms obviously belong to the microspheric generation, and three-and-a-half-chambered forms to the megalospheric generation.

Comparison
. - From the near species Globigerina (Eoglobigerina) triangularis White this one differs by its higher spire.

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


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

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