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That's why I post pictures of the family Coeloplanidae at these websites.
This specimen looks very similar to Coeloplana sp. 2 at page 95 in
Gosliner, T.M., Behrens, D.W. & Williams, G.C. (1997) Coral Reef Animals of the Indo-Pacific. 314pp.
Monterey, California: Sea Challengers.