The very large (length 8 inches) nudibranch Melibe viridis.

This nudibranch has a large oral hood that it extends to trap prey.

(Aer Bajo 2, Lembeh Strait, Sulawesi, Indonesia)

mollusk; gastropod; sea slug; nudibranch; Mollusca; Gastropoda; Nudibranchia; Dendronotina; Tethydidae; Melibe viridis; feeding behavior; oral hood, South Pacific