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Beddomeia acheronensis acheronensis 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 species has a conical shell and, along with B. franklinensis, can be separated from other Beddomeia species in the rather elongate bursa copulatrix with the bursa duct entering the posterior corner.

Classification

Beddomeia acheronensis acheronensis Ponder and Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name: Beddomeia acheronensis acheronensis 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, 100 m from helicopter site below hill, Tasmania.

Biology and ecology

In leaf litter and gravel and in fern mats & weed attached to rock shelf in stream and small trickle. Egg capsules unknown but assumed to resemble those of 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

Acheron River and small tributaries, 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.