views1 Catalog - Gorbachikella anteroapertura Catalog - Gorbachikella anteroapertura

CATALOG OF ORIGINAL DESCRIPTIONS: Gorbachikella anteroapertura BouDagher-Fadel, Banner, Brown, Simmons, Gorbachik 1995

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 -> G -> Gorbachikella -> Gorbachikella anteroapertura
Other pages this level: G. anteroapertura, G. depressa, G. grandiapertura

Gorbachikella anteroapertura

Citation: Gorbachikella anteroapertura BouDagher-Fadel, Banner, Brown, Simmons, Gorbachik 1995
Taxonomic rank: species
Type specimens: Holotype : NHML PF52999 (Pl. 5, fig. 1). Paratypes pl 5 f2-6 PF53000-53004
Type sample (& lithostrat): sampleSS94
Type age (chronostrat): Early Barremian
Type locality: Beauvoir I well (about 7 km north of Tebourba, west of Tunis, Tunisia:
Type repository: London; Natural History Museum

Current identification:


Original Description

Gorbachikella anteroapertura has an almost flat spiral side. It consists of two or more whorls, with four chambers in each whorl. The fact that the holotype is hollow proves it cannot be an internal mould. G. anterapertura has an intraumbilical aperture as in G. kugleri but in this species it tends to face anteriorly, almost reaching the periphery of the previous whorl. This aperture tends to be, in some cases (see PI. 5, fig. 5a), almost similar to a Praehedbergella type of aperture, except that it is still intraumbilical.

Extra details from original publication
We believe that this species could be the immediate ancestor of Praehedbergella. Bellier and Chitta (1981) recorded the occurrence of a similar species under the name of Caucasella hoterivica from the Barremian to the "middle Aptian" of Tunisia. In this study, C. anteroapertura ranges from the Late Hauterivian, Barremian and into the Early Aptian. We could not find any specimens resembling the species described by Salaj as "Caucasella hoterivica" from the Early Hauterivian of Tunisia and which, according to Banner and Desai (1988, pl 54) is probably the oldest known species of Praehedbergella. "C. handousi" has a dorsal side similar to G. anteroapertura but it is more flattened, the peripheral view is more compressed and the aperture on the ventral side reaches the periphery of the previous whorl i.e. it is clearly intraextraumhilical and Salaj's species is a Praehedbergella.

References:

BouDagher-Fadel, M., Banner, F. T., Bown, P. R., Simmons, M. D. & Gorbachik, T. N. (1995). Gorbachikella from the Hauterivian, Barremian-Aptian of Tunisia. Revue de Micropaléontologie. 38(3): 179-193. gs

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Gorbachikella anteroapertura compiled by the pforams@mikrotax project team viewed: 26-1-2025

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