White with dark rings and a yellow margin, on Red Sea sponge and one of the more distinctive chromodorids there.
To about 2.5 cm. The mantle is white with scattered orange spots, and the gill cluster and the rhinophores are each encircled by a large violet ring. Those two rings are the identification and are what the name means. Nothing else in the Red Sea does this.
It has been recorded at 15 m, but no published depth range was found, so treat the depth as unknown rather than assuming it is a shallow animal.
It is a sponge feeder, like the rest of its family, though the particular sponge has not been documented in accessible sources. It lives on reef slopes across the Indian Ocean and western Pacific and into the Red Sea, and it has passed through the Suez Canal into the eastern Mediterranean, where it has been recorded off southern Turkey.
The common name preserves an old genus. The animal was moved to Goniobranchus in 2012 and the scientific name here reflects that.
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.
