About Halgerda willeyi Eliot, 1904
Halgerda willeyi is a species of nudibranch in the genus Halgerda. The body of Halgerda willeyi is rigid, with a series of sharp, connected ridges running across it. Each ridge has a yellow or orange stripe along its top. The grooves that lie between the ridges have dark chocolate brown lines; these lines extend all the way out to the edge of the mantle, where they form multiple radiating stripes. This is a relatively large species of halgerdid, and it can grow up to 50 millimeters in length. The species was first described from a single specimen collected at Lifou, Loyalty Islands, by Dr A. Willey. It has since been reported across the western Indo-Pacific, including in Taiwan, Vietnam, Myanmar, Indonesia, Malaysia, and Australia, as well as in the Red Sea and in waters off Egypt.
