This genus is in need of revision, as the species concepts we have used have not been rigorously tested. Unpublished molecular data indicate that the species units we are here using appear to be justified, however they are not accompanied by clear-cut morphological characters that allow separation based on shell characters alone. As the species units appear to be overall concordant with state boundaries, we have used these boundaries to delimit species. This situation is not ideal and can only be resolved by additional molecular and morphological studies involving dense sampling.
The relatively high spire, very convex whorls and deep sutures, fine axial growth lines and rather elongated shape readily distinguish this species from I. newcombi. It reaches about 12 mm in length.
Incorrectly included in Glyptophysa by Smith (1992).
Isidorella egregia (Preston, 1906)
Class Gastropoda
Infraclass Heterobranchia
Megaorder Hygrophila
Order Lymnaeida
Superfamily Planorboidea
Family Planorbidae
Subfamily: Miratestinae
Genus Isidorella Tate, 1896
Original name: Limnea (Bulinus) egregia Preston, 1906. In Preston, H. B. (1906). Description of a new species of Limnea from north-west Australia Proceedings of the Malacological Society of London 7: 36.
Type locality: North Western Australia.
Note: Physa contortula Clessin, 1886 (Type locality: Australia) may be an earlier name for this species.
Unknown, but probably similar to that of I. newcombi.
Indian Ocean division, Pilbara and Kimberley regions, Western Australia.
This genus is in need of revision, as the species concepts we have used have not been rigorously tested and can only be resolved by additional molecular and morphological studies involving dense sampling.
Hubendick, B. (1955). Phylogeny of the Planorbidae. Transactions of the Zoological Society of London 28: 453-542.
Köhler, F., Kessner, V. & Whisson, C. (2012). New records of non-marine, non-camaenid gastropods (Mollusca: Gastropoda) from islands off the Kimberley coast, Western Australia. Records of the Western Australian Museum 27: 21-39.
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.
Walker, J. C. (1988). Classification of Australian buliniform planorbids (Mollusca: Pulmonata). Records of the Australian Museum 40: 61-89.
