Species of the B. launcestonensis group are of medium size for the genus (2.0-4.2 mm in length), rather globular. Their penis is simple. Found in the mid north and north eastern parts of Tasmania.
B. tumida is similar in shell features to B. wilmotensis and B. inflata but has a shorter spire. It has not been found in recent times so its anatomy is unknown.
Beddomeia tumida (Petterd, 1889)
Genus Beddomeia Petterd, 1889
Original name: Beddomeia launcestonensis var. A. tumida Petterd, 1889. Petterd, W. F. (1889). Contributions for a systematic catalogue of the aquatic shells of Tasmania. Papers and Proceedings of the Royal Society of Tasmania 1888: 60-83.
Type locality: The Great Lake, Tasmania.
Biology and ecology
This species has apparently not been recollected since the damming of the Great Lake and may be extinct.
Apparently restricted to Great Lake.
All species of Beddomeia are geographically isolated and have restricted ranges. B. tumida is possibly extinct as it has not been seen since Great Lake was dammed.
This species is on the Tasmanian Threatened species list of Invertebrate Animals as Endangered.
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.