Maroon lines on cream with red-orange gills; the warm-coloured one among the lined slugs.
A chromodorid to about 6 cm, the mantle cream to pale grey-white carrying four to six dark maroon to red-brown longitudinal lines, a band of orange around the margin, and orange-red rhinophores and gill plume. The lines vary in how continuous they are and are often broken into dashes. Colour temperature is the easy separation: the several Chromodoris with a similar line pattern have a white or blue ground and lack the orange gill. Among the Hypselodoris on the same ground, H. tryoni is spotted rather than lined and H. bullockii is plain pink with no pattern at all.
Feeds on sponges. The genus takes dysideid sponges and stores the sesquiterpenes from them in glands set into the mantle rim, which is a specific arrangement rather than a general nudibranch one, and it is the reason these animals crawl about in daylight with no cover.
Recorded from about 3 to 30 m on sponge-covered rubble and rock. Pairs are common, and the white spiral egg ribbon is laid on or beside the food sponge.
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.
