13577 Helcogramma gymnauchen (Weber, 1909) Tripterygiidae Triplefin blennies Tripterygiinae Blenniiformes Teleostei Red-finned triplefin Western Pacific: Indonesia, Papua New Guinea, and northern Australia. It appears to be restricted to these areas. Occurrence in southern Japan (Ref. 559) is a misidentification and refers to <i>Helcogramma hudsoni</i>.