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Beddomeia wilmotensis 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.

This species differs from other members of this group in possessing fewer ctenidial filaments (16-18) in the pallial cavity.

Classification

Beddomeia wilmotensis Ponder & Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name: Beddomeia wilmotensis 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: North of Spellmans Bridge on the western side of the Wilmot River, northern Tasmania.

Biology and ecology

This species was found living under deeply embedded stones in a small, damp seepage protected by blackberries and ferns. It lacks body and eye pigment, probably a response to its semi-troglobitic existence. 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

This species is known from Wilmot River in 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 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.