Print Fact Sheet

Beddomeia gibba Ponder and Clark, 1993

Diagnostic features

Species included in the B. bellii group are small to medium-sized (2.3-3.0 mm in length), ovate-conic to ovate and usually have a columella swelling. The penis is simple (as in B. bellii and B. protuberata) or with a lenticular brown gland in the middle. Species in this group are restricted to north western Tasmania.

This species differs from the similar Beddomeia mesibovi, B. topsiae, B. salmonis and B. [1] [2]fultoni in having a shell with a more prominent shoulder.

Classification

Beddomeia gibba Ponder and Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Beddomeia Petterd, 1889

Original name: Beddomeia gibba Ponder and Clark, 1993 in Ponder, W. F., Clark, G. A., Miller, A. 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: Small seep, on Salmon River Road, 0.2 km N of Lerunna Road, Tasmania.

Biology and ecology

Crawling amongst small sedges and the wet surface of the mud in shallow water in the seepage. 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

As for type locality.

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.