This species is most similar in shell shape to A.macedonensis, A. daylesfordensis, A. grampianensis and A.colensis, but differs from these taxa in several anatomicalcharacters. Other similar taxa include A.cooma, A. monaroensis, A. avius, A. bullerensis, A. viridarium, A. smithii, A. nanus, A. parvus and A. pisinnus.
A. otwayensis differs from other species in the following combination of characters: shell small to medium in size, spire outline straight to weakly convex; aperture slightly disjunct; central teeth with 3 pairs of basal cusps; ctenidium with 20–21 filaments; seminal receptacle at anterior edge of bursa copulatrix; ovary lobulate.
Austropyrgus otwayensis Clark, Miller & Ponder, 2003
Class Gastropoda
Infraclass Caenogastropoda
Order Littorinida
Suborder Rissoidina
Superfamily Truncatelloidea
Family Tateidae
Genus Austropyrgus Cotton, 1942
Original name: Austropyrgus otwayensis Clark, Miller & Ponder, 2003. In Clark, S. A., Miller, A. C. & Ponder, W. F. (2003). Revision of the snail genus Austropyrgus (Gastropoda: Hydrobiidae): A morphostatic radiation of freshwater gastropods in southeastern Australia. Records of the Australian Museum Supplement 28: 1–109.
Type locality: Erskine River, 80 m above Erskine Falls, Otway Range west of Lorne, Victoria.
On weeds, leaves, roots and stones. Can be locally abundant.
Small streams and rivers of the Otway Ranges, Victoria.
Most species of Austropyrgus are geographically isolated and have restricted ranges, and this one is no exception.
Clark, S. A., Miller, A. C. & Ponder, W. F. (2003). Revision of the snail genus Austropyrgus (Gastropoda: Hydrobiidae): a morphostatic radiation of freshwater gastropods in southeastern Australia. Records of the Australian Museum 28: 1–109.
