This minute (up to 1.2 mm in maximum diameter) species has a smooth shell with evenly convex whorls, and only has fine growth lines. It differs from all other species in the central radular teeth with a narrow base.
Glacidorbis occidentalis Bunn & Stoddart, 1983
Class Gastropoda
Infraclass Heterobranchia
Infrasubcohort Panpulmonata
Superorder Pyropulmonata
Order Amphibolida
Suborder Glacidorbina
Superfamily Glacidorboidea
Family Glacidorbidae
Genus Glacidorbis Iredale, 1943
Original name: Glacidorbis occidentalis Bunn & Stoddart, 1983. In Bunn, S.E. and Stoddart, J.A. (1983). A new species of the prosobranch gastropod Glacidorbis and its implications for the biogeography of South - Western Australia. Records of the Western Australian Museum 11: 49-57.
Type locality: Wugong Brook, Jarrahdale, at the Chandler Bridge, Western Australia.
In small intermittent streams, in gravel riffle sections. Locally common. Presumably feeds on small injured animals, such as insect larvae and other molluscs.
South-western Western Australia (ranges south of Perth).
The only Glacidorbis from Western Australia, found largely in intermittent streams. A report by Dolman et al. (2015) found some sequence divergence between samples from Kangaroo Gully and the Drummond Nature Reserve, suggesting the possiblity that more than one species may be present.
Bunn, S. E. & Stoddart, J. A. (1983). A new species of the prosobranch gastropod Glacidorbis and its implications for the biogeography of South Western Australia. Records of the Western Australian Museum 11: 49-57.
Bunn, S. E., Davies, P. M. & Edward, D. H. (1989). The association of Glacidorbis occidentalis Bunn and Stoddart, 1983 with intermittently–flowing, forest streams in south Western Australia. Journal of the Malacological Society of Australia 10: 25-34.
Dolman, G., Whisson, C. & Kirkendale, L. (2015). Molecular diversityof molluscs (Glacidorbidae) from Kangaroo Gully and Drummond Nature Reserve, Western Australia. Report to Department of Parks and Wildlife, Perth.
Meier-Brook, C. & Smith, B. J. (1976). Glacidorbis Iredale 1943, a genus of freshwater prosobranchs with a Tasmanian-Southeast Australian-South Andean distribution. Archiv Für Molluskenkunde 106: 191-198.
Ponder, W. F. (1986). Glacidorbidae (Glacidorbacea: Basommatophora), a new family and superfamily of operculate freshwater gastropods. Zoological Journal of the Linnean Society 87: 53-83.
Ponder, W. (2019). Glacidorbidae Ponder, 1986. Pp. 143-144 in C. Lydeard & Cummings, K. S. Freshwater Mollusks of the World: a Distribution Atlas. Baltimore, John Hopkins University Press.
Ponder, W. F. & Avern, G. J. (2000). The Glacidorbidae (Mollusca: Gastropoda: Heterobranchia) of Australia. Records of the Australian Museum 52: 307-353.
