Catalog - Dicarinella sudetica

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Dicarinella sudetica

Citation: Dicarinella sudetica Gawor-Biedowa 1980

Type specimens: pI. 7: 1-3; Holotype: specimen IG No. 45480/79/F, presented in pI. 7: 1a, b, c. Paratypes: specimens IG Nos. 45481A/79/F, 45481A, pI. 7: 2, 3.

Type locality: Nysa Trough, borehole Pisary IG, depth of 580 m; SW Poland

Type repository: Warsaw; Geological Institute (abv IG)

Diagnosis. - Test low trochospiral, biconvex (a little more convex at the ventral side than at the dorsal one), consisting of 2.5 to 3 whorls, with 5 chambers visible in the last whorl at the dorsal side, and most commonly 4 chambers visible at the ventral side; test outline subtetragonal, considerably lobulate; test surface covered with tubercles; periphery with two narrow keels situated very close to each other, fusing or disappearing at the final chamber; belt inbetween keels very narrow, imperforate; umbilicus narrow; umbilical parts of chambers displaying fragments of portici.

Description. Test biconvex with the dorsal side equally to a little more convex than the ventral one, composed of 2.5 to 3 whorls. Early whorls much narrower than the last one, composed of small-sized, spherical chambers. The last whorl includes 4 chambers trapezoidal in outline, considerably convex, especially at the dorsal side, rapidly increasing in size with growth. At both the sides of a test, chambers covered with uniformly spaced tubercles. Spiral suture and septal sutures considerably depressed. At both sides of a test, septal sutures radial, non-ornamented. Test subtetragonal in outline. Periphery with two narrow keels situated very close to each other, fusing or disappearing at the final chamber. Umbilicus narrow, up to one third of test diameter, surrounded with portici preserved in fragments at the umbilical parts of chambers. Umbilical part of the final chamber shows something like a rudimentary umbilical, slat-like swelling.

after the Sudetes where the species has been found

Variability. - There is some variability in lobulation of test outline, development of keels and their presence or absence at the final chamber, chamber convexity at the dorsal side of test (nonetheless, the chambers are always considerably con- vex).

Remarks. - The species under discussion resembles in its test form, whorl proportions. and rapid increase in chamber size in the last whorl the species Globotruncana inornata Bolli. It differs from the latter in the presence of weakly developed but distinct keels at all the chambers of the last whorl with possible exception of the final chamber.

References:

Gawor-Biedowa, E. (1980). Turonian and Coniacian foraminifera from the Nysa trough, Sudetes, Poland. Acta Palaeontologica Polonica. 25: 3-54. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Dicarinella sudetica Gawor-Biedowa 1980

Dicarinella sudetica

References:

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