Mactridae – Mactrinae: Mactra (Mactra) australis Lamarck, 1818 (‘southern trough-shell’)

Synonym(s): australis Lamarck, 1819 glabrata Schröter, 1788 (non Linnaeus) polita Chemnitz in Reeve, 1854.

Typical shell-length 40 mm. Shell normally with some purplish-brown staining. Relatively narrowly triangular outline. Lives subtidally in sand, especially in moderately exposed environments. Native. Endemic to southeastern and southwestern Australia (TAS, VIC, SA and WA). In Tasmanian waters, this is an uncommon species; scattered records on the N and NE coasts and around Flinders Island.