Flabellina rubrolineata (O'Donoghue, 1929)
Seasonally common on food source in the Solitary Islands Marine Park. Generally Tropical Indo-Pacific distribution. Migrant to the Mediterranean Sea. In Australia recorded from all states including Tasmania.
Found on food source, hydroid Halocordyle disticha.
Red lines along central dorsal surface and below cerrata may be continuous, broken as pictured here, or absent altogether.