Gymnodoris arnoldiGymnodoris arnoldi is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae. It was first described in 1957.DistributionThis species is known from southeastern Australia.DescriptionGymnodoris arnoldi has an orange-red body with translucent white rhinophores.EcologyThis species eats colonial ascidians.