Geotrochus Van Hasselt, 1823

Vermeulen, Jaap J., Liew, Thor-Seng & Schilthuizen, Menno, 2015, Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species, ZooKeys 531, pp. 1-139 : 100

Taxon classification Animalia Stylommatophora Trochomorphidae

Genus Geotrochus Van Hasselt, 1823

Geotrochus Van Hasselt, 1823: 233.

Diagnosis for the Sabah species.

Shell rather small to medium-sized, (pale) corneous to (yellowish) brown, without any colour patterns, or with brown spiral bands ( Geotrochus spilokeiria with additional white spots and stains); (low) conical with concave, flat or convex sides, apex protruding or not. Radial sculpture above the periphery inconspicuous to distinct growth lines, raised at irregular intervals or not. Spiral sculpture consisting of thin threads, at least some spiral threads close to the periphery usually slightly coarser, the others very fine, often inconspicuous or absent; no spiral sculpture below the periphery. Umbilicus closed, entirely covered by an extension of the parietal callus of the peristome.

Remarks.

We provide a review of the Sabah species of Geotrochus . We divide the genus into three informal groups.