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.
Localities for Mactra australis
Black River Beach: northern end
Chain of Lagoons: Four Mile Creek: beach
Flinders Island: Emita: foreshore
Flinders Island: Fotheringate Beach: southern end
Flinders Island: Patriarch Beach
Georges Bay: Burns Bay
Narawntapu: Bakers Beach
North coast of Tasmania (unlocalised)
Rocky Cape: Picnic Beach & rocks to S
Stanley: Anthony Beach
Stanley: Tatlows Beach