Hypselodoris tryoni reaches 10 cm. Large Indo-Pacific nudibranch (Chromodorididae) (formerly Risbecia tryoni) with cream-white mantle covered with distinctive large black spots and purple-blue edge, white gills, orange rhinophores. Remarkable behavior: pairs often move in trail-following file (one tactilely following another), characteristic of transitioned Risbecia/Hypselodoris. Lives from 5 to 40 m on coral reefs of central and western Indo-Pacific. Iconic macro photo subject in trail-following pair.
