Catalog - Gublerina acuta

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Gublerina acuta

Citation: Gublerina acuta De Klasz 1953

Type specimens: Pl. 8, Fig. 3; holotype No.258; paratypes 259 & 260

Type sample (& lithostrat): Part of the Buchecker layers

Type age (chronostrat): Uppermost Campanian

Type locality: Railroad cut about 250 m south of the railroad station at Eisenarzt, south of Siegsdorf, Upper Bavaria, southeastern Gernmany. Fould also in a small pit on the south side of the Tampico-El Mante road, about 100 m west of the railroad overpass, at the we

Type repository: Munich; Bavarian State Collection for Paleontology and historical Geology, Munich,

Diagnosis : A Gublerina with the following peculiarities: test relatively small, the initial chambers are increasing slowly; they are separated from each other by distinctly visible depressed sutures and not covered by rugosities like those of genotype G. cuvillieri.

Description : The test consists of two divergent rows of more or less globular chambers connected with each other by a calcareous lamella. The latter also contains a varying number of irregularly dispersed, often partly reniform, chambers filling almost the whole space between the two lateral rows of chambers of some of the specimens. The chambers of the lateral divergent rows are separated from each other by depressed sutures. Their size is generally increasing from the first to the last, although this increase in size is not always regular. The size of the initial chambers is increasing more slowly than of these ones of G. cuvillieri. The last chambers are often elongating a little towards the centre of the test. The whole test is sometimes compressed in the vertical direction towards the symmetric plane of both divergent rows of chambers. The calcareous lamella, filling the space between these rows, occasionally encloses the upper end of the test and part of its flanks.

The aperture of the specimens found up to now could not be seen; it can be assumed however that it is at the inner basis of the last chamher like G. cuvillieri Kikoine.

Length of the holotype: 0,483 mm. Width of the holotype: 0,384 mm.

Relationship and Differences : The species differs from genotype G. cuvillieri Kikoine. in its smaller size, daintier form, slower increase of the size of the initial chambers; quicker increase of the size of the following chambers and the hereon depending difference and irregularity of the chambers in their adult state.

Stratigraphic range: Upper Campanian - lower part of the Upper Maastrichtian.

References:

de Klasz, I. (1953a). Einige neue oder wenig bekannte Foraminiferen aus der helvetischen Oberkreide der bayerischen Alpen, südlich Traunstein (Oberbayern). Geologica Bavarica. 17: 223-244. gs V O

de Klasz, I. (1953b). On the Foraminiferal Genus Gublerina Kikoïne. Geologica Bavarica. 17: 245-251. gs V O

CATALOG OF ORIGINAL DESCRIPTIONS: Gublerina acuta De Klasz 1953

Gublerina acuta

References:

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