The coiled oviduct is oriented obliquely backwards and its bursal duct originates from the ventral side.

The species have a small number of ctenidial filaments (usually less than 20) with a slightly arched rectum and a simple penis.

[6] Beddomeia minima have small shells (1.7 - 3.7 mm in length), with a simple ovate-conic to broadly-conic and a thin inner lip and no columellar bulge.

The width of the shell umbilicus of Beddomeia minima is variable (ranging from wide to small, or closed) and represented by a chink, and its aperture shape is typically ovate.

[6][7] In this species of Beddomeia, the pallial vas deferens opens at the anterior end of the prostate gland.

The coiled oviduct has a simple U shape with an initial bend that is obliquely backwards, with some connective tissue and a soft glandular appearance.

[6] The known distribution of Beddomeia minima have been found to inhabit a singular small area on the north eastern part of Tasmania, specifically St. Patricks River in Scottsdale, and potentially in similar surrounding habitats (within a 170 km2 (66 sq mi) range).

[4] Beddomeia minima survive along with a variety of other hydrobiid species in a range of habitats including warm springs, rivers, streams, seepages and estuarine environments.

Due to their localised distribution, any changes in water quality in the St. Patricks River in Scottsdale, Tasmania, can pose a huge threat to this species.

[3] The species is threatened by industrial agriculture and aquaculture (wood and pulp plantations), mining and quarrying, modifications to natural systems (Dams and water use) and pollution (urban and domestic waste water and industrial, military, agricultural and forestry effluents).