Slender smooth-hound Zealand, including submarine features to the north such as the Three Kings Ridge, the Challenger Plateau, and the Wanganella Bank. This uncommon species is mainly found between deep, but has been recorded from deep. It prefers a temperature of around and a salinity of approximately 34.8‰. Generally swimming near the sea floor, this shark inhabits both soft and rocky-bottomed habitats in terrain ranging from plateaus to steep slopes. The slender smooth-hound has a very thin body and a broad, highly flattened head. The snout is long, with a distinctive bell-shaped outline when viewed from above. The eyes have an elongate
Spotless smooth-hound longer than the upper one. The teeth are molar-like with low cusps. Both the dorsal fins have a curved trailing edge and the distance separating them occupies about 20% of the total length of the fish. The dorsal surface and flanks are grey or greyish-brown and the ventral surface is paler. The colour is uniform and there are no spots or bands of darker or lighter colour. The spotless smooth-hound is found in the temperate and tropical Pacific Ocean between 40°N and 11°N, off the coast of Vietnam, Japan, China and Taiwan, and possibly the Philippines. It occurs on the