These nudibranch carnivores feed principally on hydroids, anemones and corals and store their prey's nematocysts (stinging cells) in the dorsal processes , useful for defense. Length 35 mm, depth 10 m.
Also known with the species name of pugnax, this species is known to be very aggressive, attacking and dismembering other eolid nudibrachs. It is known to feed on cnidarian animals.
The cerata are flattened, widest above the base, and taper to a point. The hepatic diverticula cannot be readily seen within them if there is pigment present. The tips often take on the coloration of their anemone food. The mid-dorsal band, which is cerata-free but has light cororation on it, can be seen to the right.