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Journal Molluscan Studies Advance Access originally published online on September 14, 2007
Journal of Molluscan Studies 2007 73(3):215-221; doi:10.1093/mollus/eym020
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© The Author 2007. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

A new Georissa (Gastropoda: Neritopsina: Hydrocenidae) from a limestone cave in Malaysian Borneo

Martin Haase1,*, and Menno Schilthuizen2,{dagger}

1Zoologisches Forschungsmuseum Alexander Koenig, Adenauerallee 160, D-53113 Bonn, Germany; and 2Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia

Correspondence: M. Haase; e-mail: martin.haase{at}uni-greifswald.de


  Abstract

In a previous paper, we have reported on a new, troglobitic species of Georissa and its possible parapatric origin from Georissa saulae Benthem-Jutting, 1966, which occurs outside the cave system of Batu Sanaron, a limestone outcrop in Sabah, Malaysian Borneo. These analyses were based on genetic and morphometric data. Here, we formally describe the new species adding anatomical data derived from dissections and histological serial sections as well as fine structural data of shell, operculum and radula, and compare it with its stem species. The two species differ in shell and radular morphology as well as genital characters. Since we found anatomical differences between very closely related species, we assume that dissections would be of general use for the taxonomy of Georissa and the remaining nominal genus-group taxa of the poorly known Hydrocenidae.

* Present address: Vogelwarte Hiddensee, Institut für Zoologie, Universität Greifswald, Soldmannstraße 16, D-17489 Greifswald, Germany;

{dagger} Present address: National Museum of Natural History ‘Naturalis’, PO Box 9517, 2300 RA Leiden, The Netherlands

(Received 20 March 2006; accepted 28 November 2006)


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