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 differs from other members of this group in its smaller shell with thicker inner lip, small to closed umbilicus and protoconch of about 1.3 whorls with more distinct pitting; radula with heavily indented dorsal edge of central and lateral teeth, sharply pointed median cusps of central and lateral teeth, more cusps on outer side of lateral teeth (7-8 instead of 4-5) and fewer cusps on outer marginal teeth. The mantle cavity has a weak to absent rectal arch and the female genital system with single bend in proximal coiled oviduct, the capsule gland is about equal in length to albumen gland and has a simple ventral channel.
Beddomeia franklinensis Ponder & Clark, 1993
Class Gastropoda
Infraclass Caenogastropoda
Order Littorinida
Suborder Rissoidina
Superfamily Truncatelloidea
Family Beddomeiidae
Original name: Beddomeia franklinensis Ponder & Clark, 1993. In 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.
Type locality: Franklin River, on riffle crossing at upper side of island-platform, Tasmania.
Under large stones and rock slabs in deeper parts of the river. 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..
This species occurs in the Franklin River, Tasmania.
All species of Beddomeia are geographically isolated and have restricted ranges.
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.
