A medium-sized shell which usually has a flat-topped spire, and with the edge of the whorls strongly angled and keeled. The area below the angulation is slightly concave. Distinct spiral striae are absent. A few specimens (one of which is figured) have a raised spire with the whorls sharply angled, a form referred to as Amerianna sp. by Willan & Kessner (2021).
Amerianna carinata (H. Adams 1861)
Common name: Carinate pouch snail.
Class Gastropoda
Infraclass Heterobranchia
Megaorder Hygrophila
Order Lymnaeida
Superfamily Planorboidea
Family Planorbidae
Subfamily: Miratestinae
Original name: Physa (Ameria) carinata H. Adams, 1861. In Adams, H. (1861). Descriptions of a new genus and some new species of the shells from the collection of Hugh Cuming, Esq. Proceedings of the Zoological Society of London 1861: 143-145.
Type locality: Boyne River, Queensland.
Synonyms: Physa reevii A. Adams & Angas, 1864; Amerianna gabrieli Cotton, 1942 (new name for truncata Adams).
The species of Amerianna require taxonomic revision - the classification presented here is modified but is based on shells alone.
On water weeds, wood, and similar substrates, in ponds and billabongs. Feeds on algae and detritus. Egg mass a jelly strip containing many small eggs. Development direct.
This taxon occurs in the Top End, Northern Territory, extending into far north-eastern Western Australia.
This species was treated as Amerianna reevii in previous versions of the key but examination of their type specimens has shown that carinata and reevei are probably the same species.
Baker, F. C. (1945). The molluscan family Planorbidae. Urbana USA, University of Illinois Press.
Beesley, P. L., Ross, G. J. B. & Wells, A., Eds. (1998). Mollusca: The Southern Synthesis. Parts A & B. Melbourne, CSIRO Publishing.
Hubendick, B. (1955). Phylogeny of the Planorbidae. Transactions of the Zoological Society of London 28: 453-542.
Walker, J. C. (1988). Classification of Australian buliniform planorbids (Mollusca: Pulmonata). Records of the Australian Museum 40: 61-89.
Willan, E. C. & Kessner, V. (2021). A conspectus of the freshwater molluscs of the Daly River catchment, Northern Territory. Northern Territory Naturalist 30: 108-137.
