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Beddomeia acheronensis absona Ponder and Clark, 1993

Diagnostic features

Species of the B. acheronensis group have small (1.9-2.8 mm in length) shells, that are conical with a thickened inner lip. The penis is simple and both named taxa are found in south western Tasmania.

This taxon is separated from the typical subspecies B. acheronensis acheronensis because of the following differences: the shell is slightly broader, and the protoconch microsculpture is more distinctly pitted.

Classification

Beddomeia acheronensis absona Ponder and Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name: Beddomeia acheronensis absona Ponder and Clark, 1993 in Ponder, W.F., Clark, G.A., Miller, A. & Toluzzi, A. (1993). On a major radiation of freshwater snails in Tasmania and eastern Victoria - a preliminary overview of the Beddomeia group (Mollusca: Gastropoda: Hydrobiidae). Invertebrate Taxonomy, 7: 501-750.

Type locality: Small tributary of Acheron River, 200m upstream of Jane River junction, Tasmania.

Biology and ecology

On small submerged rocks and in weed in stream. Egg capsules unknown but assumed to resemble other Beddomeia species (dome-shaped, with broad attachment base, covered with minute, mainly white sand grains and other fragments; contain a single egg). Development is direct.

Distribution

Small tributary of Acheron River, 200m upstream of Jane River junction, south-western Tasmania.

Notes

 All species of Beddomeia are geographically isolated and have restricted ranges.

Further reading

Ponder, W. F., Clark, G. A., Miller, A. C. & Toluzzi, A. (1993). On a major radiation of freshwater snails in Tasmania and eastern Victoria: a preliminary overview of the Beddomeia group (Mollusca: Gastropoda: Hydrobiidae). Invertebrate Taxonomy 7: 501-750.