Hemitriakis indroyonoi sp. nov., a new species of houndshark from Indonesia (Carcharhiniformes: Triakidae) Author White, William T. Author Compagno, Leonard J. V. text Zootaxa 2009 2110 41 57 journal article 10.5281/zenodo.187881 c6f48b59-2136-4335-813b-0a7a5f32a68a 1175-5326 187881 Genus Hemitriakis Herre, 1923 Genus Hemitriakis Herre, 1923 : 70 . Type species: Hemitriakis leucoperiptera Herre, 1923 , by original designation. For detailed definitions and discussions of the scope of this genus see Compagno (1970 , 1979 , 1984 , 1988 ). Hemitriakis was proposed by Herre (1923) as a monotypic genus for H. leucoperiptera Herre, 1923 , from the Philippine Islands . H. leucoperiptera was included in Triakis Müller & Henle, 1838 by Fowler (1941) , Bigelow & Schroeder (1948) , Garrick (1954) , Kato (1968) , Springer (1968) , and Pinchuk (1972) , but was revived by Compagno (1970) for Herre's species and Galeus japanicus Müller & Henle, 1839 . H. japanica , from off China , the Koreas, Taiwan and Japan , had been placed in the genus Galeorhinus or its synonyms by previous authors. The genus Hemitriakis was recognised by Compagno (1973a , 1973b , 1979 , 1984 , 1988 ), Steuben & Krefft (1978 , 1989 ), Cadenat & Blache (1981) , and Masuda et al. (1984) . More recently, Hemitriakis falcata Compagno & Stevens, 1993 and H. abdita Compagno & Stevens, 1993 were described from off northwestern and northeastern Australia , respectively, and H. complicofasciata Takahashi & Nakaya, 2004 , was described from off Japan and Taiwan . Hemitriakis indroyonoi is described herein from off eastern Indonesia . There is a second species of Hemitriakis in Philippine waters, Hemitriakis sp. A [ sensu Compagno et al ., 2005 ], differing from H. leucoperiptera in coloration and fin proportions (see Compagno 1970 , 1979 , 1988 ; Compagno & Stevens, 1993 ). Fowler (1941) cited a record of Hemitriakis japanica from Amboina, while Fourmanoir & Rancurel (1972) reported H. japanica from New Caledonia . We have not been able to verify the Amboina record, but a large New Caledonian Hemitriakis was deposited by P. Fourmanoir in the Museum National d'Histoire Naturelle, Paris, as Galeorhinus japanicus . This specimen has a much higher vertebral count than all other Hemitriakis except H. abdita and may represent another undescribed species of Hemitriakis or possibly an adult of H. abdita .