Systematic Revision of Indo-west Pacific Triacanthodidae

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Triacanthodids are small, bottom dwelling fishes of the shelf and slope living 100 and 600 me depth, with most speciose found below 200m.Although Tyler (1968) published a monograph on the family Triacanthodidae, there still remain systematic problems in the Indo-west Pacific species. The purpose of this study is to revisec the Indo-west Pacific triacanthodis, putting emphasis on rarely collected species.The examination on the newly collected materials from New Caledonia and Australia showed that several specie (e.g., Triacanthodes intermedius and Paratriacanthodes retrospinis) are distributed east of Australia, where no triacanthodids have been reported except for Macrorhamphososdes uradoi. Examinations on many specimens kept at various museums showed that the following 13 species in the seven genera are found in the Indo-west pacific : Atrophacanthus japonicus ; Bathyphylax bombifrons, Halimochirurgus alcocki, Halimochirurgus centriscoides, Macrorhamphosodes platycheilus, Macrorhamphosodes uradoi ; Paratriacanthodes herrei, Paratriacanthodes retrospinis ; Triacanthodes anomalus, Triacanthodes ethiops, Triacanthodes indicus, Triacanthodes intermedius ; and Tydemania navigatoris.Bathphylax has been represented by two species, B.bombifrons Myers and B.omen Tyler, which are poorly known only from very few specimens. Examinations on many addtional speciments from Australia and New Caledonai led to a conclustion that B.omen is a junior synonym of B.bombifrons.