Body colour is a purple hue, overlaid by a white frosting of superficial pigment on the back and sides. The tips of the cerata and rhinophores are orange and the outer part of the oral tentacles with white pigment. Rhinophore stalk and base of club purple, then white with a reddish purple tip. Rhinophores are lamellate.
Samla rubropurpurata was described from Madang, Papua New Guinea with an additional specimen from Sodwana Bay, Natal, South Africa. It is thought to be distributed throughout the Indo-West Pacific. It has been reported from Hawaii but significant differences in colouration make this identification doubtful, named Samla cf. rubropurpurata .