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Scyllaea pelagica  Linnaeus, 1758

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Scyllaea pelagica is characterized by a yellowish-tan colour with brown mottling, and some white markings, and by large flattened rhinophore sheaths which dwarf the small rhinophores. There are two pairs of dorso-lateral lobes, which have a jagged edge. The posterior end of the body has a flattened medio-dorsal crest which also stands vertically. There are fine dendritic gills over the inner surface of the dorso-lateral lobes and the dorsum. In some specimens are a few bright blue spots. On the sides of the body are small conical tubercles, of whitish or translucent-tan colour.
Scyllaea pelagica lives pelagically attached to pieces of floating kelp or Sargassum weed, or other floating algae, where it feeds on attached hydroids.
More informations on Scyllaea pelagica are at Bill Rudman's Sea-Slug Forum!