The crowned doto, Doto coronata, is a species of small sea slug or nudibranch, a dendronotid nudibranch, a shell-less marine gastropod mollusc in the family Dotidae. This species is found off South Africa, in the north Atlantic Ocean and in theMediterranean Sea.

(From Wikipedia.org, November 1 2010)

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The nudibranchs called by this name are probably an aggregate species consisting of Doto species which share the characteristics of red pigment spots on the tips of the ceratal tubercles and red pigment in the pseudobranch region on the inner face of each ceras. There are red to maroon pigment spots or streaks on the body. The smooth rhinophores have sheaths with dilated margins. The body is translucent white. Typically about 10mm in length. The newly described species Doto hydrallmaniae and Doto sarsiae have only recently been separated from this complex by electrophoretic methods. It is likely that other morphs are also good sibling species.
(From habitas.org.uk via EOL)