Strongly compressed keeled shell with small sunken upper whorls. Similar to G. isingi, but larger (maximum diameter about 5 mm). In both species, the keel is positioned slightly towards the "base" (if viewed with the aperture on the right).
Original name: Planorbis atkinsoni Johnston, R.M. (1879). Johnston, R. M. (1879). Further notes on the fresh-water shells of Tasmania. Papers Proceedings of the Royal Society of Tasmania 1878: 19-29.
Type locality: South Esk River, Tasmania.
On submerged leaves in rivers and streams in northern Tasmania.
Brown (1998) described the anatomy of this species.
Boray (1982) named G. isingi (and G. gilberti, as an intermediate host for the stomach fluke Orthocoelium streptocoelium.
Brown, D. S. (1981). Observations on the Planorbidae from Australia and New Guinea. Journal of the Malacological Society of Australia 5: 67-80.
Hubendick, B. (1955). Phylogeny of the Planorbidae. Transactions of the Zoological Society of London 28: 453-542.
Smith, B. J. (1992). Non-marine Mollusca. Pp. i-xii, 1-408 in W. W. K. Houston. Zoological Catalogue of Australia, 8. Canberra, Australian Government Publishing Service.
Smith, B. J. & Kershaw, R. C. (1981). Tasmanian Land and Freshwater Molluscs. Hobart, University of Tasmania.