About Thorunna halourga R.F.Johnson & Gosliner, 2001
The mantle of Thorunna halourga is pale lilac, and changes to purple in the area in front of the rhinophores and behind the gills. The slightly undulate mantle margin has a broad white band. The rhinophores have purple stalks, and their lamellae are edged with orange. The gills are white, with orange axes. This species was first described from specimens collected at Rasch Passage, Madang, Papua New Guinea and Batangas, Philippines. It has additionally been reported from tropical eastern Australia.