Blackgill catshark
The blackgill catshark or blackgill bristle shark is a deep water bristle shark known from very few specimens, found on or near the bottom on the continental slope, at off the coasts of China and Japan. Specimens can attain a total length of at least, have elongated cat-like eyes, and have two small dorsal fins set far back. They're oviparous and lay one egg at a time. This shark is a potential bycatch of deep water bottom-trawl fisheries operating within its range, but no specific information is available. In the upper jaw, there are rods of blunt, flat teeth with 3 cusps, likely used for crushing, as well as row of sharper teeth with the mid, central cusp longer and to a point. The bottom teeth are sharp, pointed, jagged and have three cusps, with the middle cusp slightly longer than the surrounding two.