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, there are only 2 pictures from that region online.
There are by now records from the whole Indo-Pacific, from Mozambique to Japan, but most of them are misidentified, following Gosliner et al (2015) page 77. They are in fact Costasiella sp. 04  Genus: Pruvot-Fol, 1951.
Many of the specimens of Stiliger ornatus from Japan here and here differ slighty, they have pale bluish rhinophores.
Very similar are:
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), and
Stiliger sp. 06   Genus: Ehrenberg, 1831 which differs by clear rhinophores with white speckling, and has a broad blue band on the cerata.
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.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch & Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
More information on Stiliger ornatus are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2021), published 23 June 2021, Stiliger ornatus  Ehrenberg, 1828
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Stiliger_ornatus.htm


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