Pleurobranchidae – Pleurobranchinae: Berthella medietas Burn, 1962 (‘mid-point sea-slug’)
Synonym(s): medietas Burn, 1962.
Typical body-length 35 mm. Lives intertidally to offshore amongst sponges. Native. Occurs in southeastern and southwestern Australia (NSW, TAS, VIC, SA and WA); also New Zealand.