Bullina lineata (Gray, 1825)
Common in the Solitary Islands Marine Park. Recorded from Japan, Indonesia, and New Zealand. In Australia recorded from the Western Australia coast from Albany to Exmouth, on the east coast from far north Queensland south to eastern Victoria and including Lord Howe and Norfolk Island.
Found in intertidal and shallow subtidal areas, feeds on cirratulinid polychaete worms in silt or sandy substrate. Depth from intertidal to 45 m.
White shell with well spaced axial and spiral red lines. Animal is transparent whitish with margins of foot, headshield and posterior mantle folds a brilliant electric blue. Eye spots are visible on the head. This species is able to retract completely into its shell and has a thin operculum. Grows to 20 mm shell length.
Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.56.
Robert Burn, 2015. Museum Victoria Field Guides: Nudibranchs and related molluscs. Museum Victoria, Melbourne. p.44.