Gymnodorididae: Paliolla cooki (Angas, 1864) (‘Cook’s sea-slug’)

Synonym(s): cooki Angas, 1864.
Typical body-length 12 mm. Lives intertidally to offshore on bryozoans, specifically Beania magellanica, on which it feeds. Native. Endemic to northern, western and southern Australia (NSW, TAS, VIC, SA, WA and NT).