Pleurobranchidae – Pleurobranchinae: Berthella serenitas (Burn, 1962) (‘sweet-spot sea-slug’)

Synonym(s): serenitas Burn, 1962.

Typical body-length 20 mm. Lives intertidally to offshore amongst sponges, specifically Plakina species, on which it feeds. Native. Endemic to southeastern Australia (TAS and VIC).