Bubik, M.; Kaminski, M.A.; (2001) Remarks on the type locality and current status of the foraminiferal species Rzehakina epigona (Rzehak, 1895). In: Hart, M. and Kaminski, M.A. and Smart, C., (eds.) Proceedings of the Fifth International Workshop on Agglutinated Foraminifera: (Plymouth, U.K., September 6-16, 1997). (pp. pp. 71-80). Grzybowski Foundation: London, UK.

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Abstract

A likely topotype locality is proposed for Rzehakina epigona. As the type specimen of Silicina epigona Rzehak, 1895 is assumed to be lost, we undertook a search for new material in the type area, Zdounky village in Moravia. A single locality provided a total of 138 Rzehakina specimens. The greenish grey marly clays sampled here contain a rich fauna of both planktonic and benthic foraminifers belonging to the Abathomphalus mayaroensis Zone. In addition to R. epigona, rare specimens attributable to R. inclusa, R. lata, R. minima and even a typical form of R. fissistomata are present at the Zdounky locality. Biometrical analysis was carried out on 52 complete specimens using the involution value "Z" and the length/breadth ratio. Most of the Rzehakina epigona topotypes form a tight cluster with "Z" values between 4 and 15%, although forms that appear transitional to R. lata have Z values of around 20%. The length/breadth ratio is more variable, with values ranging between 1.2 and 2.0. However, the Z value measured from Rzehak's type figure is significantly higher and outside the range of variability of this cluster of specimens. We conclude that Rzehak's drawing may be imprecise. Unfortunately, we were not able to study the inner structure of these specimens owing to the lack of internal filling in these specimens. The unfavourable preservation and low abundance of specimens from the type locality do not enable a proper revision of the species Rzehakina epigona at this time.

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