CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina interposita 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 interposita
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, A. praecursoria, A. primitiva, A. proxima, A. pseudosubsphaerica, A. pseudotopilensis> >>

Acarinina interposita

Citation: Acarinina interposita Subbotina 1953
Rank: Species

Current identification/main database link: Acarinina interposita Subbotina 1953

Original Description
[Translation from the Russian.- In general appearance this species strongly resembles Acarinina pentacamerata {Subbotina} [Globorotalia pentacamerata, 1947], differing basically in having a lesser number of chambers in each whorl, and in their closer arrangement. Test comparartively large with a rounded outline and a weakly convex, even slightly flattened dorsal side and a semispheric convex ventral side. Test consists of two and one-half whorls, with four chambers in the final whorl. Chambers in the final whorl well defined and disproportionately large in comparison with the chambers of the first whorl. Earlier chambers very small, barely discernible due to the dense spinosity of the wall. Chambers flattened on the dorsal side, arrangedat nearly right angles to one another; on the ventral side, they are semispherical almost as in Globigerina, or are slightly compressed so that the general surface of the ventral side is conical, and the outline of each chamber is triangular. Dimensions of all four chambers of the final whorl are almost equal. In most cases the chambers adjoin one another very closely, especially on the dorsal side. On the ventral side the chambers are more loosely arranged, due to which there is a deep depression in the center of the ventral side, an umbilicus. Sutures depressed, looking like weakly defined grooves on the dorsal side; on the ventral side they are weakly curved, almost straight, extending radially from the umbilicus to the periphery. Peripheral margin broadly rounded. Umbilicus a deep depression formed by the loose attachment of the umbilical ends of the chambers. Aperture simple, crescentic, along the marginal suture, extending troughout its length. Wall thick, densely covered with short and thick spines, which are longer, tapering more strongly on the ventral side near the umbilicus, and shorter tubercle-like on the dorsal side.


Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 9): 257-326. gs V O

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


Acarinina interposita compiled by the pforams@mikrotax project team viewed: 19-4-2021

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