CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina pseudotopilensis Subbotina 1953

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 pseudotopilensis
Other pages this level: << < 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, A. praecursoria, A. primitiva, A. proxima, A. pseudosubsphaerica, A. pseudotopilensis, A. punctocarinata, A. quadratoseptata, A. rotundimarginata, A. rugosoaculeata, A. subintermedia, A. subpentacamerata, A. tadjikistanensis, A. triplex, A. umbilicata, A. vedica,

Acarinina pseudotopilensis

Citation: Acarinina pseudotopilensis Subbotina 1953
Rank: Species
Holotype Repository: St. Petersburg, Russia; VNIGRI
Holotype number: 4123

Current identification/main database link: Acarinina pseudotopilensis Subbotina 1953


Original Description: [Translation from the Russian] - At first glance this species is reminiscent of Acarinina crassaformis (Galloway and Wissler) [Globigerina crassaformis, 1927], differing in a looser attachment of the chambers, a more rounded chamber outline, and a considerably more coarsely spinose surface. Test planoconvex, consisting of two whorls. Dorsal side flattened, less commonly slightly convex, ventral side highly convex with or without a very small umbilical depression. Peripheral margin rounded, markedly sinuous, without a keel. In the final whorl there are four chambers, which differ considerably from one another in size. These have rounded outlines, often almost as in Globigerina. It is characteristic that the chambers are very loosely attached to one another, so that the outer margin is strongly lobate. On the dorsal side the chambers are oval, often with angular ends, due to which, in cross section, the chambers of the last whorl are rectangular, especially the final one. On the ventral side they resemble sectors of a circle. Umbilical ends of chambers are broadly rounded, and usually are neither tapered nor elongate, nor are they raised up in a peak, as in Globorotalia. Septal sutures simple, depressed, slightly curved, almost straight. Spiral suture usually indistinct. Aperture slitlike, along the marginal suture, extending halfway between the umbilicus and the peripheral margin. Wall coarsely spinose; the spines cover the entire wall uniformly and are equal in dimensions on both dorsal and ventral sides. [Dimensions.- Diameter 0.35-0.40 mm.; thickness 0.25-0.30 mm. This species, as all Acarininas, is greatly variable in test dimensions. Moreover, tests with considerably varying chamber shapes are assigned to this species, from completely rounded in all sections to rectangular in cross-section. The former outwardly strongly resemble Globigerina (convergent similarity), and especially Globigerinas such as Globigerina varianta Subbotina, from which it differs in the more flattened dorsal side and the coarse spinosity of the wall. Besides tests with loosely arranged chambers, specimens are often found with closely adjacent chambers, as in Acarinina crassaformis.

References:

Subbotina, N., (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres, 2239: 1-144.


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Acarinina pseudotopilensis compiled by the pforams@mikrotax project team viewed: 23-8-2017

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