The dusky snout catshark (Bythaelurus naylori) is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. This species is found from the Southwest Indian Ridge, southwestern Indian Ocean. The specimens were collected from depth in both bottom trawls and midwater trawls. The shallowest catch record of the new species, possibly at, came from a midwater trawl. This species can be distinguished from its two closest congeners, B. giddingsi and B. lutarius, by a combination of prominent comb-like dermal denticles along the upper caudal-fin margin, absence of oral papillae, uniform body coloration, and noticeable dark dusky snout; Bythaelurus giddingsi has oral papillae present and a variegated color pattern, while B. lutarius lacks a caudal crest of enlarged denticles and matures at a much smaller size than the new species.[1]