Setocallosa—a new genus and species of land snail from Arnhem Land, Australia (Stylommatophora: Camaenidae)

Abstract

The new, monotypic camaenid genus Setocallosa is described for the new species S. pathutchingsae from Arnhem Land, Top End of the Northern Territory. This camaenid is characterized by a combination of distinct morphological features, such as a small, weakly elevated shell with widely open umbilicus and thick callus on the parietal wall, a wide epiphallic flagellum, elongated penis and short bursa copulatrix with subglobose end. The relationships of Setocallosa with the other camaenid genera in the area are investigated by means of mtDNA, but its phylogenetic position remains ambiguous. S. pathutchingsae occurs in sympatry with Arnhemtrachia ramingining, but based on morphology the two camaenids can be readily differentiated.

http://zoobank.org/urn:lsid:zoobank.org:pub:1C50CF24-7FEE-446A-9724-A0A4E850B5AA

Keywords:

• anatomy
• Australian Monsoon tropics
• Helicoidea
• morphology
• Northern Territory
• Pulmonata
• taxonomy

Acknowledgements

This work has been made possible through financial support from the Australian Government (ABRS grant RF210–05 to FK). Special thanks are due to Michael Shea (AM) for producing illustrations of genitalia, and to Sue Lindsay (AM) for conducting the SEM work. Thanks are also due to the reviewers, Corey Whisson (WAM) and John Stanisic (QM), for their helpful comments on an earlier manuscript.