Stylochoidea sp. 01  Superfamily: Poche, 1926

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Species of the superfamily Stylochoidea Poche, 1926 are often mistaken for sea slugs because of their head tentacles, which look like the rhinophores of sea slugs.
The above specimens ( there is a second specimen in the picture, top left) were identified by Juliana Bahia in the facebook group Marine Flatworms, here is her comment:"maybe a Stylochid... some acotyleans are really difficult to tell by one photo, and without histology." Thank you, Juliana!
This species is characterized by a mottled light and dark grey colour, and and by light greyish head tentacles, which are located pretty near to the anterior margin (bottom right).