CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina falsospiralis 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 falsospiralis
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, > >>

Acarinina falsospiralis

Citation: Acarinina falsospiralis Davidzon & Morozova 1964
Rank: species
Type locality: village of Tutkaul, Sanglak Range, Tadzhik depression, Tadzhikistan.
Type age: Upper Paleocene, Thanetian
Type sample and level: upper Bukhara Beds, lower Karatag Horizon
Type & figured specimens: holotype (fig. 5a-c), no. 3514/ 5.
Description on pages: 26-28

Current identification/main database link: Acarinina subsphaerica (Subbotina 1947)


Original Description
Test small, with a round equatorial outljne and an egg-shaped axial one, formed by a high spire consisting of three whorls rapidly increasing in height. In the last whorl are 4½ to 5 narrow. high, convex chambers, closely adjoined. The last chamber is more convex and rises above the remaining ones, overhanging the umbilical region. Sutures depressed, septal sutures on the spiral side weakly curved in the early part of the last whorl, between the later chambers straight. Peripheral margin undulate, broadly rounded. Umbilicus narrow. Aperture slit-shaped, opens onto the umbilicus. Test wall finely perforate, thinly spinose. Spinosity more distinct on the umbilical side.

Size: Greater diameter 0.25 mm., lesser diameter 0.24 mm., height 0.3 mm.

Extra details from original publication

Variation. - The degree of inflation of the last chamber, which in some specimens is slightly flattened out along the axis of growth, varies. (We consider the growth axis of spirally coiled forammifera to be the spiral line crossing the septa at midpoint perpendicularly to their surfaces.)

Comparison. - This species differs from Acarinina spiralis (Bolli) by its higher spire and the distinct spinosity of the wall on both sides of the test; from Acarinina aquiensis (Loeblich and Tappan) by the greater number of chambers in the umbilicus and the less coarse spinosity of the umbilical ends of the chambers.

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]. Paleontological Journal. 3: 23-29. gs


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

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