Beddomeia tumida Petterd, 1889



Taxonomy & Nomenclature

Synonym/s: Beddomeia launcestonensis Petterd, 1889; Beddomeia tumida Smith, 1992; Tasmaniella tumida Iredale, 1943


Conservation Status

Last record: 1920's

Since rediscovered (Richards et al., 2022)

IUCN RedList status: Critically Endangered (Possibly Extinct)


"Happily, Beddomeia tumida appears to have been rediscovered during surveys of Great Lake by Hydro Tasmania in 2007, although better preserved specimens are needed by expert taxonomists to confirm this fully."


"The team was initially searching at yingina / Great Lake for another previously thought to be extinct snail species, the Great Lake giant freshwater limpet (Ancylastrum cumingianus). It was rediscovered during an aquatic invertebrate survey when the lake was at a historic low.

As part of Hydro Tasmania’s environmental surveys, the team returned to the now refilled lake late last year, armed with old roof tiles sourced from a tip shop, plus ropes and buoys.

Entura’s Field Ecologist and Water Quality Consultant Kevin Macfarlane explains that the tiles were lowered to various depths (2-10 metres) to the lake floor in the hope they would become inhabited by bottom-dwelling species, such as the limpet.

Returning in January this year to retrieve the tiles, Kevin said that they not only found the limpets but also three very tiny specimens of an aquatic snail called Beddomeia tumida – the first time the live snail has been recorded in the area since 1900."




Great Lake (near Helen Island), Tasmania, Australia (Bryant & Jackson, 1999)


Biology & Ecology










Bryant, Sally L. and Jackson, J. (1999). Tasmania's Threatened Fauna Handbook: What, Where and How to Protect Tasmania's Threatened Animals. Threatened Species Unit, DPIWE, Hobart. [p. 382-386]
Clark, S. (2011). Beddomeia tumida. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. ( Downloaded on 28 January 2012.
Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.
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(3): 501-750. [Abstract]

Régnier, Claire, Fontaine, Benoît and Bouchet, Philippe. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions. Conservation Biology 23(5): 1214-1221.

Richards, Karen, Macfarlane, Kevin R. and Green, Ellie. (2022). A unique survey method for freshwater limpets leads to the rediscovery of Beddomeia tumida Petterd, 1889 (Mollusca: Tateidae) in yingina/Great Lake, Tasmania. The Tasmanian Naturalist 144: 1-11.


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