Uncommon in the Solitary Islands Marine Park. Endemic to New South Wales waters.
Frequents tidal rock pools and platforms, where it is often found crawling over rocks and algae. Recorded from a depth of at least 6 m.
Found in association with similarly coloured encrusting food sponge, Clathria sp. A small species easily overlooked, it has an orange mantle with a close covering of colourless translucent caryophyllidia (spiculate tubercles - glass like spicules which project from the skin) giving the mantle a rough "furry" feel and appearance. Grows to about 12 mm.
Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.190.
Australian Museum, Sea Slug Forum. http://www.seaslugforum.net/find/rostarbu. Accessed 26/09/2018.