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I've seen the second variant only two times at Cabilao and at Moalboal, Cebu, the first variant is pretty common.
Layton et al. (2018) show that these morphotypes correspond to different taxa, they call it Chromodoris cf. dianae Gosliner & Behrens, 1998. "For instance, Gosliner and Behrens (1998) noted variation in the orange colouration on the gills and orange markings along the margin in C. dianae. Most notably, only the gill tips appear orange in C. dianae, while C. cf. dianae has orange colouration along the outside of the whole gill and has orange spots along the margin."
I changed the second colour form on 21 July 2019 into Chromodoris sp. 07 Genus: Alder & Hancock, 1855.
Gosliner (2020) described the colour form which Layton et al. (2018) stated to be Chromodoris dianae Gosliner & Behrens, 1998
as Chromodoris alcalai Gosliner, 2020, and stated the other colour form to be Chromodoris dianae Gosliner & Behrens, 1998.
The 'Final Published Version' was posted on July 12, 2021, the authorship is Gosliner, 2021.
I changed Chromodoris dianae Gosliner & Behrens, 1998 on 16 July 2021 into Chromodoris alcalai Gosliner, 2020,
and Chromodoris sp. 07 Genus: Alder & Hancock, 1855 into Chromodoris dianae Gosliner & Behrens, 1998.
Gosliner, T. M.; Behrens, D. W. (1998). Five new species of Chromodoris (Molluscs: Nudibranchia: Chromodorididae) from the tropical Indo-Pacific Ocean.
Proceedings of the California Academy of Sciences. 4(50): 139 - 165, available online at http://www.biodiversitylibrary.org/page/15659747
Layton, K. S.; Gosliner, T. M.; Wilson, N. G. (2018). Flexible colour patterns obscure identification and mimicry in Indo-Pacific Chromodoris nudibranchs (Gastropoda: Chromodorididae).
Molecular Phylogenetics and Evolution. 124: 27 - 36, available online at https://doi.org/10.1016/j.ympev.2018.02.008
Gosliner, T. M. (2020). Sleuthing cryptic Chromodorids (Mollusca, Nudibranchia): adding to Philippine marine biodiversity.
Philippine Journal of Systematic Biology, Volume 14 Issue 2 - 2020 | 1,
available online at http://asbp.org.ph/2020/07/27/volume-14-issue-2-special-issue-no-2/
More information on Chromodoris alcalai as Chromodoris dianae are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2021), published 16 July 2021, Chromodoris alcalai Gosliner, 2021
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Chromodoris_alcalai.htm