The only specimens of these I saw were two found off the reef runway in Honolulu, Oahu, on 22 July 1985. One of them measured 62mm in length. When I first saw them I would have bet money they were closely related to Risbecia imperialis due to their size, their shape, and especially their habit of queuing or trailing behavior. However, Gosliner & Johnson (1999) figure the radular teeth and they are distinctly bicuspid, a primary characteristic of the genus Hypselodoris.
Links:
Sea
Slugs of Hawaii
Sea
Slug Forum
Reference:
Gosliner, T.M. & R.F. Johnson. 1999. Phylogeny of Hypselodoris (Nudibranchia: Chromodorididae) with a review of the monophyletic clade of Indo-Pacific species, including descriptions of twelve new species. Zoological Journal of the Linnaean Society (1999), 125:1-114.
Created 20 April 2009