Discodorididae: Rostanga calumus Rudman & Avern, 1989 (‘fake sea-lemon’)
Synonym(s): calumus Rudman and Avern, 1989 arbutus Burn, 1957 non Angas, 1864.
Typical body-length 20 mm. Lives subtidally on sponges, specifically Axosuberites species, on which it feeds. Native. Endemic to southeastern and southwestern Australia (NSW, TAS, VIC, SA and WA).
Order: Euctenidiacea – Doridacea
no coastal locality records for this species currently available