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This species is Janolus sp. 7 in IPN at page 319,
let me quote: "...has a yellow sub-apical ring on each ceras with mottled cream spots below the ring."
The caruncle is cream, the rhinophores are brownish/purple with white tips.
Pretty similar are:
Janolus savinkini which differs by the rhinophores and the cerata: pale yellowish/tan with a bluish/purple apex
Janolus sp. 03 which has opaque white specks on the cerata and rhinophores,
Janolus flavoanulatus which differs by the rhinophores: blueish tinge with darker apices, and by the cerata: translucent with a diffuse yellowish ring below the purple ring
This species was posted on 24 June 2003 at these websites as Janolus sp. A Genus: Bergh, 1884, and changed on 12 September 2011 into
Janolus sp. 01 Genus: Bergh, 1884.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
More information on Janolus sp. 01 as Janolus sp. 4 are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2020), published 7 January 2020, Janolus sp. 01 Genus: Bergh, 1884
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Janolus_sp_01.htm