Pisidium hallae most closely resembles P. etheridgei but can be distinguished mainly by its more elongate shell and by the fact that the two species are geographically separated (for the most part). Also, P. hallae is less variable than P. etheridgei. It reaches 4.5 mm in length.
Euglesa hallae (Kuiper, 1983)
Common name: Pea shell, pea clam, pill clam
Class Bivalvia
Infraclass Heteroconchia
Cohort Heterodonta
Megaorder Neoheterodontei
Order Sphaeriida
Superfamily Sphaerioidea
Family Sphaeriidae
Subfamily: Sphaeriinae
Genus Euglesa Jenyns, 1832 (Type species: Euglesa henslowiana Jenyns, 1832 (= Pisidium personatum Malm, 1855) (also sometimes cited as Tellina pusilla Gmelin, 1791)
Original name: Pisidium hallae Kuiper, 1983. In Kuiper, J. G. J. (1983). The Sphaeriidae of Australia. Basteria 47: 3-52.
Type locality: Yarrangobilly River at Cave Rd, off Snowy Mountains Hwy, New South Wales.
This species occurs in swamps, springs, and creeks. Four to seven embryos may be found in its brood pouch. Suspension and deposit feeder.
P. hallae is found along the Great Dividing Range in New South Wales and Victoria as well as several localities in Tasmania.
Korniushin, A. V. (2000). Review of the family Sphaeriidae (Mollusca: Bivalvia) of Australia, with the description of four new species. Records of the Australian Museum 52: 41-102.
Lee, T. (2019). Sphaeriidae Deshayes, 1855 (1820). Pp. 197-201 in C. Lydeard & Cummings, K. S. Freshwater Mollusks of the World: a Distribution Atlas. Baltimore, John Hopkins University Press.
Lee, T. & Ó Foighil, D. (2003). Phylogenetic structure of the Sphaeriinae, a global clade of freshwater bivalve molluscs, inferred from nuclear (ITS-1) and mitochondrial (16S) ribosomal gene sequences. Zoological Journal of the Linnean Society 137: 245-260.
