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Beddomeia kershawi Ponder & Clark, 1993

Diagnostic features

Species of the B. launcestonensis group are of medium size for the genus (2.0-4.2 mm in length), and rather globular. Their penis is simple. Found in the mid north and north eastern parts of Tasmania.

B. kershawi differs from other members of this group in having smaller shell (except for B. krybetes); female genital system with bursal duct joining oviduct in front of posterior pallial wall, and coiled oviduct extending well behind posterior edge of bursa copulatrix (also in B. wilmotensis). This species is closely related to B. launcestonensis and B. krybetes, and the shell is almost indistinguishable from the latter.

Classification

Beddomeia kershawi Ponder & Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name Beddomeia kershawi 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: Lake River, tributary of Macquarie River at Macquarie Settlement on Ross-Cressy Road, Tasmania.

Biology and ecology

This species occurs in a large stream flowing through paddocks, where it lives under rocks. It was moderately abundant in the 1980s but has recently become scarce (Karen Richards pers. comm.). Egg capsules presumably 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

Lake River, Tasmania.

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 Endangered.

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.