Tellinidae – Tellininae: Macomona deltoidalis (Lamarck, 1818) (‘triangular tellin’)

Synonym(s): deltoidalis Lamarck, 1818 diemenensis Deshayes, 1854 tristis Deshayes, 1854 semifossilis Sowerby, 1867.
Typical shell-length 45 mm. Lives intertidally in mud on sheltered shores. Native. Endemic to southeastern and southwestern Australia (QLD, NSW, TAS, VIC, SA and WA). In Tasmanian waters, this is a widespread and locally abundant species.