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The cerata are can easily be cast off (autotomised) when the animal is disturbed.
This species was the the "Opisthobranch of the Week" at Michael D. Miller's Slug Site.
The specimen of the picture #2, and #3 was posted on 23 September 2014 at these websites as Cyerce bourbonica Yonow, 2012, the specimen #1 was posted on 29 December 2015 at these websites also as Cyerce bourbonica Yonow, 2012, because I thought it might be a strange colour form.
I changed my mind and believe it is an undescribed species of Cyerce Bergh, 1871, and changed it on 19 October 2017
into Cyerce sp. 02 Genus: Bergh, 1871.
Rudman, W.B., 2008 (September 15) Cyerce pavonina Bergh, 1888. [In] Sea Slug Forum. Australian Museum, Sydney.
Available from http://www.seaslugforum.net/factsheet/cyerpavo
More information on Cyerce sp. 02 as Cyerce sp. 1 are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 19 October 2017, Cyerce sp. 02 Genus: Bergh, 1871
available from http://www.Philippine-Sea-Slugs.com/Sacoglossa/Cyerce_sp_02.htm