5931 Mustelus griseus Pietschmann, 1908 Triakidae Houndsharks Triakinae Carcharhiniformes Elasmobranchii Spotless smooth-hound Northwest Pacific: Japan, Korea, China, Taiwan, and Viet Nam (Ref. 244). Possibly occurring in the Philippines (Ref. 13563). AMNH 26686 Mustelus griseus AMNH 34835 Mustelus griseus AMNH 44139 Mustelus griseus