Costasiella kuroshimae

Costasiella kuroshimae
Costasiella cf. kuroshimae on Avrainvillea erecta. Locality: Lizard Island, Great Barrier Reef. The length of the slug is about 1 cm (38 in).
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Family: Costasiellidae
Genus: Costasiella
Species:
C. kuroshimae
Binomial name
Costasiella kuroshimae
Ichikawa, 1993

Costasiella kuroshimae (also known as a leaf slug, sea sheep, or leaf sheep) is a species of sacoglossan sea slug. Costasiella kuroshimae are shell-less marine opisthobranch gastropod mollusks in the family Costasiellidae. Despite being animals, they indirectly perform photosynthesis, via kleptoplasty.