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The pictures #1 and #2 were misidentified and posted on 19 June 2003 at these websites as Hypselodoris bullockii (Collingwood, 1881) [Chromodoris].
I changed them on 18 August 2011 into Hypselodoris sp. 07 Genus: Stimpson, 1855,
the picture #9 was posted on 5 October 2014 as Hypselodoris sp. 08 Genus: Stimpson, 1855.
This species is as Hypselodoris sp. 8 in IPN at page 268.
Let me quote Epstein et al. (2018) on the etymology:
"The name variobranchia comes from Latin for variable gills, referring to the gill, which may be either orange or bright purple."
Pretty similar are:
Hypselodoris bullockii which differs by the pale pinkish background colour, and by thin white marginal band,
Hypselodoris violacea which differs by the dark blueish-purple colour of the rhinophore clubs.
Hypselodoris apolegma which differs by the purple colour, and by the reticulate white edging of the mantle.
Thorunna halourga which differs by the broad white mantle margin, and by the low gill pocket.
This picture shows the two colour morphs mating.
I changed all morphs
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426 pp.
Epstein, H. E.; Hallas, J. M.; Johnson, R. F.; Lopez, A.; Gosliner, T. M. (2018). Reading between the lines: revealing cryptic species diversity and colour patterns in Hypselodoris nudibranchs (Mollusca: Heterobranchia: Chromodorididae).
Zoological Journal of the Linnean Society. 2018, XX, 1–74. With 40 figures., available online at https://doi.org/10.1093/zoolinnean/zly048
How to cite:
Köhler, E. (2020), published 22 June 2020, Hypselodoris variobranchia Gosliner & R.F. Johnson in Epstein et al., 2018
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Hypselodoris_variobranchia.htm