Catalog - Globigerina pileata

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Globigerina pileata

Citation: Globigerina pileata Khalilov 1956

Type specimens: pl. 2, figs. 3a-c, holotype, no. 250.

Type sample (& lithostrat): Not designated. Rather frequent.

Type age (chronostrat): Ranges from the Paleocene to the middle Eocene.

Type locality: Holotype from the northeastern foothills of the Maly Caucasus, Nakhichevan A.S.S.R. Found also in northeastern Azerbaidzhan S.S.R., and in the Maly Balkhan, Turkmen S.S.R.

Type repository: Baku; Geological Institute, Academy of Sciences, Baku, Azerbaijan

[Translation from the Russian. - Test often curved, dorsal side convex, with three whorls. In the two early whorls there are four small chambers in each. In the later whorl there are three large chambers, the last one being oblique to the remaining chambers.
[Test low conical, often curved; the dorsal side is moderately convex, curved. Following the initial small chamber, in the first whorl there are four barely discernible chambers; in the second whorl there are four semispherical chambers which gradually increase in size; and in the third whorl there are three large inflated chambers. Of the last three chambers, the largest, the apertural chamber, is oblique to the preceding ones, with one end sloping toward the initial part of the test. Ventral side concave or straightened, with three large, strongly inflated chambers, of which the last one is perpendicular to the preceding ones. Septal sutures narrow, straight, rather weakly curved, depressed. Aperture small, slitlike, in the last chamber, at the side of the umbilical area. Wall calcareous, densely porous.

Diameter 0.51 mm.; thickness 0.37 mm.

[Comparison. - The position of the last chamber in this species varies markedly, with its end deflected toward either the umbilicus or the periphery. The other end of the chamber, being oblique to the preceding ones, has a tendency to partially overlap them. The present species is similar to Globigerina quadritriloculinoides Chalilov, from the upper Paleocene and lower Eocene of Azerbaidzhan, but differs from it in its outline and the arrangement of the chambers

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

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina pileata Khalilov 1956

Globigerina pileata

References:

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