Onchidium daemelli (Semper, 1885)
Probably common throughout the Solitary Islands Marine Park. Distributed throughout the Indo-west Pacific region.
Frequents intertidal areas with mud substrates, near mangroves.
An air breathing shell-less sea slug, whose colour may vary from grey through olive and dark green. Feeds on algae and detritus, secretive under rocks and in crevices. In some areas known as the Common Mangrove Slug. Grows to 35 mm.
Australian Museum, Sea Slug Forum. http://www.seaslugforum.net/find/onchid. Accessed 08/09/2018.