CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina compacta Gudina 1966

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 -> A -> Acarinina -> Acarinina compacta
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Acarinina compacta

Citation: Acarinina compacta Gudina 1966
Rank: Species
Type locality: Holotype (fig. 3) from a depth of 135-140 m, borehole 26, Poluy River at Salekhard, where the Poluy enters the Ob; figured paratype (fig. 4) from a depth of 171.0-181.3 m, borehole 4, in the profile from Muzhi, on the left arm of the Ob River, west to Til'tim; both in the Urals of northwestern Siberia, USSR.
Type age: Quaternary. Ten specimens.
Holotype Repository: Novosibirsk; Geology and Geophysics, Siberian Division, Academy of Sciences of the USSR, Novosibirsk
Type & figured specimens: pl. 8, figs. 3, 4, X 80: Fig. 3a-c, holotype; 4a-c, paratype: ; holotype (fig. 3), no. 241/62; paratype (fig. 4), no. 241/63.

Current identification/main database link:


Original Description
[Translation from the Russian. - Diagnosis. Test with a flattened dorsal and convex ventral side. two to three whorls. Four chambers in the outer whorl. Sutures depressed, radial on ventral side, oblique on dorsal side. Umbilical region compact.

[Description. - Test small. with a flattened dorsal side and convex ventral side. Sometimes on the dorsal side the chambers of the initial whorl rise up slightly. Test outline lobate. Peripheral margin compressed-rounded. Compactly arranged chambers form 2-3 whorls on the dorsal side. Chambers of initial whorls very small, barely discernible even at high magnification. 4-5 chambers, more often 4, in the outer whorl, increasing slightly in size as added. Chamber shape on ventral side triangular, on dorsal side roughly rectangular. Sutures depressed, on ventral side straight, radial (in a schematic drawing they have the form of a slanted cross), on dorsal side slightly curved. Umbilical ends of chambers tightly appressed. Umbilicus absent or in rare cases very weakly expressed. Aperture observed at the base of the last chamber in the form of a small semicircular opening, located between the umbilical region and the peripheral margin. Wall porcellaneous, white, coarsely perforate, with large spines on the ventral side. Microstructure of wall granular.

Size: Dimensions, mm. - Holotype Paratype Other specimens (8) Diameter 0.21 0.16 0.15-0.22 Thickness 0.15 0.10 0.10-0.15

Extra details from original publication
[The variation in the morphological features of Acarinina compacta Gudina is insignificant. Five-chambered as well as typical four-chambered tests are observed. The convexity of the dorsal side varies slightly.

(Comparison. - The species described is probably related to A. umbilicata Gudina, which is stratigraphically lower in the section. It differs from A. umbilicata above all by lacking a broad umbilicus, by the smaller test size, less sharply lobate margin, and more coarsely spinose wall. No other close species are known.]

Editors' Notes
The Quaternary specimens described by Gudina (1966) are clearly not a species of Acarinina (which went extinct in Paleogene), as no muricate texture is evident on the illustrated specimens.

References:

Gudina, V. I. (1966). Foraminifera and stratigraphy of the Quaternary deposits of northwestern Siberia [in Russian]. Akadameiia nauk SSSR Sibirsk Otdeleniye lnst Geologii i Geofiziki Trudy, UDK. 563.12(119) (571.1): 1-132. gs


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Acarinina compacta compiled by the pforams@mikrotax project team viewed: 29-1-2020

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