Nembrotha milleri  Gosliner & Behrens, 1997

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Nembrotha milleri is dark grey-green to blackish green and has blackish longitudinal wrinkles down the body. It's favorite prey is the green-ringed ascidian Sigillina signifera, but it feeds also on other ascidians. A strange colour variant has red spots and a red line at the rhinopore pocket. The identification was confirmed by David W. Behrens: "All the features of this critter are perfect Nembrotha milleri, except the red"
More information on Nembrotha milleri are on Bill Rudman's Sea-Slug Forum!