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"I'm usually very cautious about identifying tiny juvenile nudibranchs because they differ so much from adults. However this one is quite straightforward. It's a tiny juvenile Hypselodoris zephyra. I call it that because it's a common species and I have seen lots of individuals of all sizes."
Pretty similar are
Hypselodoris maritima which differs by its longitudinal black lines, and by a blue submarginal mantle border, and a yellow band inside,
Hypselodoris nigrostriata which differs by its gills, triangular in cross-section, and by the rhinophores which lack the opaque white tips, the gills also lack the white spots. The black lines are parallel rather than oblique. The background colour of the body has a bluish or purplish tinge.
IPN writes on Hypselodoris nigrostriata: "Known from the western Indian Ocean of Tanzania, the United Arab Emirates, and the Red Sea."
NUDIPIXEL has additional pictures from the eastern Indian Ocean of Thailand, Indonesia, and from the western Pacific Ocean of Indonesia, Taiwan, and the Philippines.
Dr. Richard C. Willan writes in a comment at NUDIXEL: "...as I have said several times before I think they are just colour forms of the same species."
Bill Rudman writes:" ...the difference between these two species is debatable."
This picture was posted on 06 Oct. 2003 at these websites as Hypselodoris nigrostriata, if they are distinct species, this one has white tips of the rhinophores - I changed it on 25 May 2012 into Hypselodoris zephyra.
This species was posted on 13 January 2010 at these websites as Hypselodoris zephyra Gosliner & Johnson, 1999.
It is a convention in malacology to use the first initials of authors with the same family name to distinguish between them,
that is R.F. Johnson for Rebecca Fay Johnson and S. Johnson for Scott Johnson. I changed the authority on 8 May 2016.
More information on Hypselodoris zephyra are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 8 May 2016, Hypselodoris zephyra Gosliner & R.F. Johnson, 1999
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Hypselodoris_zephyra.htm