CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina discors Myatliuk 1970

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 discors
Other pages this level: A. acarinata, A. boudreauxi, A. clara, A. compacta, A. crassaformis simulata, A. discors, A. falsospiralis, A. inaequiconica, A. indolensis, A. intermedia, A. interposita, A. kiewensis, A. mattseensis alticonica, A. mcgowrani, A. microsphaerica, A. multicamerata, A. multiloculata, A. pentacamerata acceleratoria, A. pentacamerata camerata, A. pentacamerata erevanensis, A. planodorsalis, > >>

Acarinina discors

Citation: Acarinina discors Myatliuk 1970
Rank: species
Type locality: In the neighborhood of the village of Karat, Yablonov area. Pokut'ye. eastern Carpathians, Ukraine, USSR
Type age: Upper Eocene, Acarinina rotundimarginata-A. bullbrooki zone
Type sample and level: Nizhnebystritskaya [Lower Bystritsa] Formation, in variegated argillites.
Holotype Repository: Leningrad; All-Union Petroleum Scientific-Research Geological-Prospecting Institute (VNIGRI), Leningrad, USSR
Type & figured specimens: holotype (fig. 8a-c) and paratype (fig. 10a, b), no. 433-220.

Current identification/main database link:


Original Description
Translation from the Russian. - Test small, biconvex, slightly flattened dorsally. Spire consists of 2-2.5 whorls, in the last of which 4 or 4.5 chambers, gradually increasing in size as added, are clearly seen. Chambers or the first whorls stand slightly above the surface of the chambers of the last whorl. On the dorsal side the chambers are roughly rectangular with arcuately concave margins, and twice as high as wide. Chambers are added at angles of 90° relative to one another. On the ventral side the chambers are triangular. They fit together tightly. The last chamber is large and inflated, almost as wide as the entire diameter of the coil. Umbilicus not noted. Sutures depressed. slightly curved on the dorsal side and almost straight on the ventral side. Peripheral margin narrow, lobate. Aperture slitlike. Wall with short spines.

Size: figured specimens: Fig. 4. diameter 0.24 mm, thickness 0.19 mm: fig. 5, diameter 0.24mm thickness 0.14 mm

Extra details from original publication
General remarks and comparison. - This species bears a great similarity to three species: Acarinina bullbrooki (Bolli) [Globorotalia bullbrooki, 1957], A. rotundimarginata Subbotina, and A. intermedia Subbotina. From the first species, which is close in arrangement and shape of the chambers, it differs by its smaller, on the average, size, and flatter ventral side. From A. rotundimarginata the new species differs by its flatter ventral side and more convex dorsal side, very small umbilicus, and more spinose wall. From the third species, described by Subbotina from the Goryachiy Klyuch horizon of the Northern Caucasus, and which the new species resembles in size, arrangement and outline of chambers on the dorsal and ventral sides, and also structure of the aperture, it differs by its more convex dorsal side and flatter ventral side, and also by the less spinose wall. The Acarinina that we have found is intermediary between A. intermedia and A. rotundimarginata and evidently is genetically related to them.

References:

Myatliuk, L. V. (1970). Foraminifera from the flysch deposits of the Eastern Carpathians (Cretaceous-Palaeogene). Vses. Neft. Nauchno-Issled. Geol-Razved. Inst (VNIGRI), Trudy. 282: 1-225. gs


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

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