Click the thumbnail photos to enhance!
Let me quote Pola, Hallas & Gosliner (2019):"Etymology The specific name, flavoanulatus refers to the yellow subapical ring of the cerata (from the Latin words flavus, yellow and anulatus, ringed)."
This species is Janolus sp. 7 in IPN at page 319.
Pretty similar are:
Janolus sp. 01 which differs by the rhinophores: brown with white tips, and by the cerata: yellow subapical ring,
Janolus savinkini which differs by the rhinophores: yellowish with blue tips, and lacks the yellowish ring below the purple ring at the cerata,
Janolus tricellariodes which has opaque white specks on the cerata and rhinophores.
This picture was posted on 20 February 2011 at these websites as Janolus sp. B Genus: Bergh, 1884, which is now Janolus savinkini, because I thought it to be a colour variant. I realized on 22 March 2013 that it is distinct in IPN.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Pola M., Hallas J.M. & Gosliner T.M. (2019). Welcome back Janolidae and Antiopella: Improving the understanding of Janolidae and Madrellidae (Cladobranchia, Heterobranchia) with description of four new species.
Journal of Zoological Systematics and Evolutionary Research. 57(2): 345-368.,
available online at https://doi.org/10.1111/jzs.12257
How to cite:
Köhler, E. (2019), published 9 May 2019, Janolus flavoanulatus Pola & Gosliner, 2019
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Janolus_flavoanulatus.htm