Indo-West Pacific, from the Red Sea (type locality, Sudan) across the Indian Ocean to the western and central Pacific, including Japan, the Philippines and Indonesia.
Description
A small, elongate, slug-shaped polycerid nudibranch (the name means 'slug-shaped'). Originally described as Nembrotha limaciformis from the Red Sea, it was later moved to Tambja and in 2017 to the genus Martadoris.
Deep saffron-red to bright orange body, either nearly plain or with yellowish-white to cream spots and tubercles on the back and sides. Rhinophores are saffron-red with a purple spot near the tip, and the 3–5 bipinnate gills have purple tips.
Similar species
Other orange Martadoris and Tambja, such as Tambja kava, look similar; the purple tips to the rhinophores and gills are the key mark.