Distribution: Status unknown in the Solitary Islands Marine Park. Recorded from New South Wales, Victoria, South Australia and southern Western Australia. Possibly at northern most extremity of range in southern Queensland.

Ecological Notes: Specimen pictured discovered in intertidal rock pool. Feeds on sponges.

Additional Notes: Ovate in shape, white in colour with prominent spicules, those in the mantle wall forming a visible framework. White sheathed rhinophores, white gills.  Specimen pictured approximately 25 mm long.

References: Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.168.

Australian Museum, Sea Slug Forum at http://www.seaslugforum.net/showall/triposse. Accessed 25/02/2020.