Pale grey with black lines running the length of the back, often two to a sponge.
A phyllidiid to about 5 cm, pale pink-grey to white with three or four black lines running lengthwise along the back and low rounded tubercles arranged between them, usually pink-tipped. The rhinophores are pink to black. It is separated from Phyllidiella by the tubercles being lower and more evenly spread, and from Phyllidia by the absence of yellow.
Like the rest of the family it is hard-bodied, breathes through folds beneath the mantle margin rather than through a dorsal gill, and feeds on sponges whose chemistry it takes up and secretes. Pairs on one sponge are common, and so are the fine white egg ribbons laid beside them. Recorded from about 5 to 30 m. The phyllidiids as a group are where most misidentification in nudibranch photographs happens: several genera share the hard warty body and the same three or four colour schemes, and the differences are in the tubercle arrangement rather than in anything more obvious.
Ratings are per location: 1 means found on most dives that look for it, 5 means a handful of records. Where enough dives have been logged the figure is calculated from them; otherwise it is an editorial estimate, and says so. We publish habitat and destination, not the dive site.
