This very small species (about 1 mm in maximum diameter) has multiple, distinct spiral ribs - with three dorsal and two ventral.
Glacidorbis circulus Ponder & Avern, 2000
Class Gastropoda
Infraclass Heterobranchia
Infrasubcohort Panpulmonata
Superorder Pyropulmonata
Order Amphibolida
Suborder Glacidorbina
Superfamily Glacidorboidea
Family Glacidorbidae
Genus Glacidorbis Iredale, 1943
Original name: Glacidorbis circulus Ponder & Avern, 2000. In Ponder, W. F. & Avern, G. J. (2000). The Glacidorbidae (Mollusca: Gastropoda: (Heterobranchia) of Australia. Records of the Australian Museum 52: 307–353.
Type locality: Marine Creek, tributary of Mersey River, northeast of Railton, Tasmania.
In small streams, springs and swamps, amongst moss, roots of water plants and similar substrates.
North-central Tasmania.
Ponder, W. F. (1986). Glacidorbidae (Glacidorbacea: Basommatophora), a new family and superfamily of operculate freshwater gastropods. Zoological Journal of the Linnean Society 87: 53-83.
Ponder, W. (2019). Glacidorbidae Ponder, 1986. Pp. 143-144 in C. Lydeard & Cummings, K. S. Freshwater Mollusks of the World: a Distribution Atlas. Baltimore, John Hopkins University Press.
Ponder, W. F. & Avern, G. J. (2000). The Glacidorbidae (Mollusca: Gastropoda: Heterobranchia) of Australia. Records of the Australian Museum 52: 307-353.
