CATALOG OF ORIGINAL DESCRIPTIONS: Turborotalia czeczvaensis 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 -> T -> Turborotalia -> Turborotalia czeczvaensis
Other pages this level: T. altispiroides, T. bannerblowi, T. bykovae, T. cambayensis, T. centralis perfecta, T. clemenciae, T. czeczvaensis, T. hirsutoides, T. kotarduensis, T. lata, T. munda franzenaui, T. pseudoampliapertura nukhulensis, T. pseudoampliapertura sinaiensis, T. pseudobesa, T. vagalkhodensis

Turborotalia czeczvaensis

Citation: Turborotalia czeczvaensis Myatliuk 1970
Rank: species
Type locality: Chechva (Czeczva) River, Pokut’ye, eastern Carpathians, Ukraine
Type age (chronostrat): lower Oligocene (Rupelian), Cibicidoides lopjanicus Zone
Type sample (& lithostrat): Lopyanetskaya Fm.
Type repository: Leningrad; All-Union Petroleum Scientific-Research Geological-Prospecting Institute (VNIGRI). Leningrad

Current identification/main database link:


Original Description
Test average to small in size, flattened dorsally and inflated ventrally, slightly elongated, ratio of greater to lesser diameter 1.4-1.1. Spire consists of two whorls, the earlier of which is in the same plane as the later one. In the outer whorl four rapidly enlarging chambers are observed, the first of which is twice as small as the preceding chambers, the next two are of almost the same size, and the last one the largest, hemispherical, lying on top of the three that come before. The width of this chamber is somewhat less than or equal to the width of the whole test. Early chambers in the inside whorl in megalospheric forms are large, spherical (fig. 4), in microspheric forms the chambers are much smaller, but they increase in size very rapidly. Umbilicus broad but shallow. Sutures depressed, radial on the ventral side and weakly curved on the dorsal side. Peripheral margin rounded , lobate. Aperture umbilico-marginal, a broad opening between the umbilicus and the peripheral margin, often going over onto the latter. In better preserved tests a narrow lip is seen along the aperture below the last chamber, which stands above it. Wall moderately reticulate, finely perforate, thin, usually very much broken.

Size: Dimensions, mm.: Greater diameter 0.24-0.42, lesser diameter 0.20-0.35; thickness 0.16-0.28. Dimensions of figured specimens, mm.: Fig. I, greater diameter 0.36, lesser diameter 0.33, thickness 0.22; fig. 2, greater diameter 0.25. lesser diameter 0.21, thickness 0.16; fig. 3, greater diameter 0.35, lesser diameter 0.25. thickness 0.19: fig. 4, greater diameter 0.42, lesser diameter 0.35, thickness 0.28; fig. 5, greater diameter 0.4, lesser diameter 0.3, thickness 0.23.

Extra details from original publication
General remarks and comparison. - Among the tests, recovered in large quantity but usually broken, unusual specimens with 4 and 4.5 chambers in the last whorl are found. The very last chamber in these becomes reduced in size, and all the chambers lie crosswise. In other specimens the entire test is an elongated rhomb in shape and the chambers are of almost uniform size. In the Iargest tests the last chamber is inflated and broad, the tests roundedly rectangular in outline (figs. 4, 5). Such a broad variation in test form is evidently connected to some age variation in the species and to the forms belonging to different generations.

Among the known species of Turborotalia and "Globigerina" no similar species have been located. From the species Globigerina increbescens Bandy, 1949, described from the Upper Eocene Jackson Formation of Alabama, this species differs by its more elongated test and well separated chambers and by the presence of an umbilicus. G. increbescens also probably belongs to Turborotalia, it has a rounded test more inflated ventrally, which consists of four almost equally sized chambers which are tightly conjoined at the center of the ventral side.

Editors' Notes
The illustrations and description of this poorly preserved taxon indicate a moderately reticulate, finely perforate test with a broad, shallow umbilicus suggesting possible synonymy with Turborotalia increbescens Bandy (with which Myatliuk, in fact, compared her new taxon czeczvaensis). However, the holotype illustration (figs. 3a-c) does not appear to correspond to the other illustrations of Myatliuk, which indeed resemble increbescens (holotype not seen). [Berggren & Wade 2018]

References:

Berggren, W. A. & Wade, B. S. (2018). Problematica. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 20): 511-524. gs V O

Myatliuk, L. V. (1970). Foraminifera from the flysch deposits of the Eastern Carpathians (Cretaceous-Palaeogene). Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel 'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 282: 1-225. gs


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Turborotalia czeczvaensis compiled by the pforams@mikrotax project team viewed: 20-1-2021

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