Catalog - Acarinina quadratoseptata Catalog - Acarinina quadratoseptata

CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina quadratoseptata Davidzon & Morozova 1964

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 quadratoseptata
Other pages this level: << < 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 djanaensis, A. triplex, A. umbilicata, A. vedica

Acarinina quadratoseptata

Citation: Acarinina quadratoseptata Davidzon & Morozova 1964
taxonomic rank: species
Described on page(s) : 28-30
Type specimens: holotype (fig. 1a-c), no. 3514/6; and other figured specimens, nos. 3514/7 (fig. 2a-c), 3514/8 (fig. 3a-c), 3514/9 (tf. 1 a-c).
Type sample (& lithostrat): middle Bukhara Beds, lower Aruktau Horizon.
Type age (chronostrat): Upper Paleocene, Thanetian
Type locality: Kizilcheshme welL Kyurendag, Turkmenistan
Type repository: Moscow; Geological Institute (GIN), Academy of Sciences of the USSR

Current identification:


Original Description

Test small. Equatorial outline subovate or subquadrate, axial outline angular. Test has two or three whorls. Height of the whorls rapidly increases. Diameter of the last whorl almost equals its height. Spiral side flat or weakly convex, umbilical side convex. In the last whorl are 5 to 5½ inflated, closely adjacent chambers which slowly increase in size. Sutures depressed, straight, in the early part of the last whorl barely noticeably curved. Umbilicus narrow, deep. Septal surface of the last chamber subquadrate, flat, often slightly depressed at the middle of its base. Peripheral margin undulate, angular. Aperture small, slit-shaped, at the middle of the marginal sutures of the umbilical side. Wall finely spinose.

Size:
Greater diameter 0.46 mm., lesser diameter 0.25 mm., height 0.30 mm.

Extra details from original publication
Variation. - The number of chambers in the last whorl is usually 5 (figs. 1-3), less often 5½ (tf. 1). The dimensions and the shape of the septal surface of the last chamber (figs. 1b, 2b, 3b, 4b) vary.

Comparison. - From Acarinina pentacamerata (Subbotina) and Acarinina subpentacamerata Militsina (1961) this species differs by its small dimensions, flatter spiral side, subovate-subquadrate equatorial outline, weakly undulate peripheral margin, and subquadrate septal surface; from Acarinina praecursoria Morozova, 1957 by its straight sutures, subquadrate septal surface, and by the slow growth, tight arrangement, and small, little varying number of the chambers.

Editors' Notes
The description was republished in English in Davidzon & Morozova 1965.

References:

Davidzon, R. & Morozova, V. G. (1964). Планктонные и бентосные известковые фораминиферы бухарских слоев (палеоцен) Тадхикской депрессиы [Planktonic and benthonic calcareous foraminifers of the Bukhara Beds (Paleocene) of the Tadzhik depression]. Paleontologicheskiy Zhurnal. (3): 23-29. gs

Davidzon, R. & Morozova, V. G. (1965). Planktonic and benthonic calcareous foraminifers of the Bukhara Beds (Paleocene) in Tadzhik depression. International Geology Review. 7(10): 1819-1825. gs

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Acarinina quadratoseptata compiled by the pforams@mikrotax project team viewed: 20-9-2024

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Comments (2)

Avatar
Le Coze

It seems that the standard romanization of давидзон is Davidzon (not Davidson)

A. quadratoseptata was first published in: Davidzon, R.; Morozova, V. (1964). Планктонные и бентосные известковые фораминиферы бухарских слоев (палеоцен) Тадхикской депрессиы - Planktonic and benthonic calcareous foraminifers of the Bukhara Beds (Paleocene) of the Tadzhik depression. Палеонтологический журнал - Paleontological Journal. 3: 23-29

and one year later in English in: Davidzon, R.; Morozova, V. (1965). Planktonic and benthonic calcareous foraminifers of the Bukhara Beds (Paleocene) in Tadzhik depression. International Geology Review. 7(10): 1819-1825., available online at https://doi.org/10.1080/00206816509474242

Cheers,

François

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Jeremy Young(UK)

Thanks - I've added those details