Janolus incrustans  Pola & Gosliner, 2019

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Janolus incrustans is characterized by a translucent/clear body, rhinophores and cerata, with some small white spots. There is pale tan pigment on the outer third of the cerata and brownish pigment on the rhinophores. There are tubercles/papillae on the cerata which have pointed clear tips and a pink subapical band. The papillate rhinophores have also pink pigment near the tips. The caruncle is tan.
This species is as Janolus sp. 11 in Gosliner et al. (2015) page 308.
Let me quote Pola et al (2019):"Etymology This species is named from the Latin incrustans, meaning encrusted, and referring to the opaque white pigment that appears to encrust the body." and
"Remarks Externally, this species is clearly different from any other described species of the genus. The cerata and rhinophores are intensely papillate with white opaque pigment covering the whole body. Another distinguishing character is their long rhinophores. Initially, this species appears similar
to Janolus mirabilis  Baba & Abe, 1970; but Janolus incrustans lacks the distinct gap between anterior and posterior clusters of
cerata (Baba & Abe, 1970)."
There are some nice shots of Janolus mirabilis  Baba & Abe, 1970 online, from the Amami-Ooshima Islands, Japan, from Milne Bay, Papua New Guinea, from Hawaii, and from the Sunshine Coast, Australia.
This species was posted on 12 June 2018 at these websites as Janolus sp. 07  Genus: Bergh, 1884, I identified and changed it on 5 September 2019
into Janolus incrustans  Pola & Gosliner, 2019.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch & Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
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
Baba, K., & Abe, T. (1970). Two species of Janolidae from Toyama Bay, Japan.
The Veliger, 13(1), 63–66.
How to cite:
Köhler, E. (2020), published 5 December 2020, Janolus incrustans  Pola & Gosliner, 2019
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Janolus_incrustans.htm


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