Cup Coral Nudibranch (black)

Phestilla melanobrachia is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Trinchesiidae. Description There are two known colour forms of Phestilla melanobrachia, black and orange.They have been found to be genetically identical. The colour matching the colour of the dendrophyll... Read more in Seabook