A species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc.
Members of the order Nudibranchia are simultaneous hermaphrodites. In mating, individuals darts their penis toward each other to induce one to act as a male and the other as the female. The victorious one to penetrate the body wall is the dominant male.
Eggs are deposited on a substratum where they develop and hatch into (planktonic) vestigial veliger larval stage and further grow as adults.
40 mm in length
Western Pacific Ocean and eastern Indian Ocean in depths of waters up to 40 metres.
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Image by q phia - Flickr, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=94711616
Image by Alexander Vaseinin - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?