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Beddomeia inflata Ponder & Clark, 1993

Diagnostic features

Species of the B. launcestonensis group are of medium size for the genus (2-4.2 mm in length), and rather globular. Their penis simple. Found in the mid north and north eastern parts of Tasmania.

This species differs from other members of this group its central teeth of the radula possessing straighter dorsal edges; female genital system with bend in distal coiled oviduct; pallial cavity with rectum of short S-shape (also in B. wilmotensis, but differs from that species in the coiled oviduct extending to the posterior edge of the bursa copulatrix and the posterior end of the ctenidium overlapping the pericardium).

Classification

Beddomeia inflata Ponder & Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name: Beddomeia inflata Ponder & Clark, 1993 in Ponder, W.F., Clark, G.A., Miller, A.C. and 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: Heathcote Creek, on Castra Roadd, Upper Castra, Tasmania.

Biology and ecology

Under large stones and rock slabs in deeper parts of the river. The white egg capsules are laid on the undersides of rocks and are like those of other species of Beddomeia - dome-shaped, with broad attachment base, covered with minute, mainly white sand grains and other fragments and containing a single egg. Development direct.

Distribution

This species is known from a small stream in weedy, cleared land which flows from the village of Upper Castra.

Notes

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

This species is on the Tasmanian Threatened species list of Invertebrate Animals as Rare (small population at risk).

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.