Only Glyptophysa aliciae and Bayardella johni have similar heavy periostracal spiral ridges. B. cosmeta has a narrower spire and a less distinct shoulder and tends to be smaller than G. aliciae. B. cosmeta is also more spindle-shaped (elongate) compared to B. johni.
Bayardella cosmeta (Iredale, 1943)
Class Gastropoda
Infraclass Heterobranchia
Megaorder Hygrophila
Order Lymnaeida
Superfamily Planorboidea
Family Planorbidae
Subfamily: Miratestinae
Genus Bayardella Burch, 1977
Original name: Glyptamoda cosmeta Iredale, 1943. In Iredale, T. (1943). A basic list of the freshwater Mollusca of Australia. Australian Zoologist 10: 188-230.
Type locality: Calala Lagoon, near Tamworth, New South Wales.
Under wood and stones, in streams. Capable of aestivation (Smith and Burn, 1976); biology otherwise unstudied.
This species occurs in Queensland, New South Wales and Victoria (Murray-Darling Division), and isolated pockets of Central Australia (Northern Territory).
This distinctive species is rather rare.
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Iredale, T. (1943). A basic list of the fresh water Mollusca of Australia. Australian Zoologist 10: 188-230.
Iredale, T. (1944a). Guide to the freshwater shells of New South Wales. Part 2. Australian Naturalist 11: 113–127.
Smith, J. B. & Burn, R. (1976). Glyptophysa cosmeta (Iredale, 1943) in Victoria (Lymnaeoidea: Planorbidae), with notes on aestivation. Journal of the Malacological Society of Australia 3: 175-176.
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Walker, J. C. (1988). Classification of Australian buliniform planorbids (Mollusca: Pulmonata). Records of the Australian Museum 40: 61-89.
