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).
This species was posted at these websites with a wrong authorship: Ehrenberg, 1831, the description by Ehrenberg is in
F.G. Hemprich & C.G. Ehrenberg, Symbolae physicae seu icones et descriptiones animalium evertebratorum sepositis insectis quae ex itinere per Africam Borealem et Asiam Occidentalem, novae aut illustrate redierunt. Decas I Mollusca. Berlin. Vol. 1 (plates) [1828], Vol. 2 (text, 126 pp.) [1831]. The plate with the drawing and the name was published in 1828, I changed the authorship on 22 December 2018 into Ehrenberg, 1828
More information on Stiliger ornatus are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2018), published 22 December 2018, Stiliger ornatus  Ehrenberg, 1828
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Stiliger_ornatus.htm


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