Distribution: Common in the Solitary Islands Marine Park. Widespread distribution throughout the Indo-Pacific region. In Australia recorded from Western Australia, throughout the Great Barrier Reef south to Port Phillip Bay in Victoria and Tasmania.

Ecological Notes: Usually found under rocks and coral slabs in depths ranging from intertidal to at least 30 m.

Additional Notes: A common species that ranges in colour from a translucent yellow to bright red. Feeds on a variety of sponges and reportedly some species of hard coral. Small white glands on the dorsal surface exude a milky defensive secretion when the animal is disturbed. Grows to at least 30 mm in length.  

References: Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.79.

Australian Museum, Sea Slug Forum. http://www.seaslugforum.net/find/bertcitr. Accessed 17/07/18.