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Beddomeia pallida Ponder & Clark, 1993

Diagnostic features

Species in the B. tasmanica group have small shells (length 1.2-2.8 mm) with a depressed spire and open umbilicus. The penis is simple. 

This species has a very depressed shell and is also unusual among Beddomeia members in usually maintaining a pale colour, unlike most species which, despite having a white shell, have the shell surface stained or coated so that they appear to be brown or even black.

Classification

Beddomeia pallida Ponder & Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name Beddomeia pallida 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: Headwaters of Second River, 7.5km east along Doaks Road from Lilydale, Tasmania.

Biology and ecology

Under stones and leaves in tributary streams. 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 tributaries of the Second River and few nearby streams in north-eastern 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.