Catalog - Globigerina triloculinoides nanus Catalog - Globigerina triloculinoides nanus

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina triloculinoides var. nanus Khalilov 1956

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 -> Globigerina triloculinoides nanus
Other pages this level: << < G. supracretacea, G. taminensis, G. tarchanensis, G. tardita, G. taroubaensis, G. tecta, G. terquemi, G. tetracamerata, G. topilensis, G. triangularis, G. tricamerata, G. trigonula, G. triloba, G. trilocularis, G. triloculinoides, G. triloculinoides nanus, G. triloculinoides parva, G. tripartita tapuriensis, G. trivialis, G. tschikryzovi, G. tumbili, G. turbulenta, G. turcmenica, G. turritilina praeturritilina, G. turritilina turritilina, G. tuschepsensis, G. umbilicata, G. umbrica, G. uruchaensis, G. utilisindex, G. varianta> >>

Globigerina triloculinoides nanus

Citation: Globigerina triloculinoides var. nanus Khalilov 1956
taxonomic rank: variety
Described on page(s) : 236
Type specimens: pl. 1, fig. 4a-c, no. 243.
Type age (chronostrat): Lower to upper Paleocene
Type locality: northeastern foothills of the Maly Caucasus, Nakhichevan A.S.S.R
Type repository: Baku; Geological Institute, Academy of Sciences, Baku, Azerbaijan

Current identification/main database link: Subbotina velascoensis (Cushman 1925)


Original Description

Translation from the Russian. - Test quadrangular, low conical, inflated, consisting of two and one-half to three whorls with four or three chambers in each. Septal sutures compressed only in the final whorl. Surface with a coarse alveolar structure. Test small, strongly inflated, low conical, quadrangular, consisting of two and one-half to three whorls. In the final whorl there are three chambers gradually increasing in size, of which the final is the largest and is perpendicular to the two preceding ones. They are nearly spherical in outline. The chambers of the preceding whorls are very small, and are almost or altogether indistinguishable. Usually they are in the same plane as the chambers of the final whorl. Sutures between the chambers of the last whorl narrow, straight, rather slightly depressed. Wall calcareous, surface covered by rather large alveolar sculpture; not infrequently, the pits are in rows. Aperture slitlike, with a weakly discernible lip, situated on the final chamber.

Size:
Diameter 0.27 mm.; thickness 0.20 mm.

Extra details from original publication
Comparison. - Globigerina triloculinoides nanus has been found in association with Globigerina triloculinoides Plummer. Specimens of this variety from the oldest beds have a fine alveolar sculpture; in more recent beds this sculpture is coarser. It differs from the typical form in its smaller size, slightly deepened septal sutures, and in the character of the coarse alveolar sculpture.

Found also in northeastern Azerbaidzhan S.S.R., and in the Maly Balkhan, Turkmen S.S.R

References:

Khalilov, D. M. (1956). 0 pelagicheskoy faune foraminifer Paleogenovykh otlozheniy Azerbaydzhana [Pelagic Foraminifera of the Paleogene Deposits of the Azerbaizhan SSR]. Trudy Instituta Geologii, Akademiya Nauk Azerbaidzhanskoi SSR. 17: 234-255. gs


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Globigerina triloculinoides nanus compiled by the pforams@mikrotax project team viewed: 24-5-2024

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