Stiliger ornatus  Ehrenberg, 1831

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Stiliger ornatus is characterized by its pale greenish-orange body, and by the orange and black bands on the cerata. The cerata are basally of the same colour as the body, followed by an orange band, then a broad black medial band, then again an orange band, the outmost tip is black. The rhinophores are black with a dorsal pale orange spot, fading into black towards the tip. There is a dark gray/black patch on the head.
The original description of Stiliger ornatus is from the Red Sea, now there are records from the whole Indo-Pacific, from Mozambique to Japan, but most of them are misidentified. They are in fact Costasiella sp. 04  Genus: Pruvot-Fol, 1951. Many of the specimens from Japan here and here differ slighty, they have pale bluish rhinophores.
Very similar is Costasiella sp. 04  Genus: Pruvot-Fol, 1951, which differs by the eye spots: between the rhinophores and close together, by the colour of the cerata, and by the colour of the patch on the head (blue, orange, and blue).
More information on Stiliger ornatus are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2018), published 15 May 2017, Stiliger ornatus  Ehrenberg, 1831
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Stiliger_ornatus.htm


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