Hemitriakis Herre, 1923

Ebert, David A., White, William T., Ho, Hsuan-Ching, Last, Peter R., Nakaya, Kazuhiro, Séret, Bernard, Straube, Nicolas, Naylor, Gavin J. P. & De Carvalho, Marcelo R., 2013, An annotated checklist of the chondrichthyans of Taiwan, Zootaxa 3752 (1), pp. 279-386 : 323-324

Genus Hemitriakis Herre, 1923

Tope Sharks / aeǿûắé

Hemitriakis Herre, 1923: 70 . Type species: Hemitriakis leucoperiptera Herre, 1923 , by original designation.

Hemitriakis complicofasciata Takahashi & Nakaya, 2004

Ocellate Topeshark / Ṙù‡ǿûắ

Hemitriakis complicofasciata Takahashi & Nakaya, 2004: 248 , figs 1–6, 7a, 8a, 10a. Holotype: HUMZ 165226 , male 796 mm TL, 24°40'N – 25°30'N, 125°50'E – 126°40'E, Okinawa Prefecture, Japan, 14 Aug 1999.

Local synonymy: Hemitriakis complicofasciata: Takahashi & Nakaya, 2004: 248 .

Taiwan voucher material: NSYU uncat. embryo, male, 224mm TL, Dong-gang, Mar 1996 ( Takahashi & Nakaya, 2004) .

Remarks: Very similar in appearance to H. japanica , but differs in having embryos with a distinct complicated pattern of line and rings, more precaudal vertebrae, and a well developed (vs. rudimentary) nasal flap. Two additional specimens were sent to the Fishery Institute at Cheng-gong on 27 Apr 2012, the photos were examined by one of us ( HCH).

Conservation status: Data Deficient.

Hemitriakis japanica ( Müller & Henle, 1839)

Japanese Topeshark / H†‡ǿûắ

Galeus japanicus Müller & Henle, 1839: 58 , pl. 22. Holotype: RMNH (dry)?

Local synonymy: Galeorhinus japanicus : Jordan & Evermann, 1902: 318; Fowler, 1941: 192; Chen, 1963, fig. 25 (THUP 1808); Yang, 1981: 2, fig. 1. Galeus japonicus : Jordan & Richardson, 1909: 162. Eugaleus japonicus: Nakamura, 1936: 35 , pl. 15, fig. 2. Galeorhinus japonicus: Matsubara, 1955: 119 ; Chen, 1948: 33; Chen, 1956: 19; Teng, 1962: 110, fig. 29.; Yang & Chen, 1971: 1, fig. 1. Hemitriakis japanica: Compagno, 1970: 65 ; Compagno & Stevens, 1993: 197 (44 spec.); Shen, 1984a: 62, fig.; Shao et al., 1993: 133; Chen & Joung, 1993: 57, pl. 6 (fig. 5); Chen, 2004: 21; Takahashi & Nakaya, 2004: 254 (24 spec.); Shao et al., 2008: 236; White et al., 2009: 41; Shen & Wu, 2011: 66, fig.

Taiwan voucher material: (17 spec.) CSIRO H 6294-30 , female, 775 mm TL, Da-xi, 23 May 2005 ; CAS uncatalogued (TAI-170), juvenile male 569 mm TL, UF 159316, juvenile male 414 mm TL, Da-xi, 24 May 2005 ; NMMB-P 3227 , Fu-gui-jiao, Taipei, 1 Jan. 2000 ; NMMB-P 4700 , Penghu, 1 Aug 1957 ; NMMB-P 15128 , Taichong , 20 Apr 1962 ; NMMB-P 6448 , Taichong , 8 May 1962 ; NMMB-P 6491 , Taichong , 16 Dec 1962 ; NMMB- P 6492, Taichong , 8 May 1961 ; NMMB-P 15800 , 16 Feb 2011 ; NMMB-P 15851 , NMMB-P 15854 , 3 Mar 2011 ; AMNH 258161 (tissue accession GN9913 ), female 455 mm TL , CSIRO H 7394-20 (tissue accession GN9914 ), juvenile male 590 mm TL , HUMZ 213815 (tissue accession GN9912 ), female 873 mm TL, Da-xi, 13 Mar 2012 ; MNHN 2013-0510 (tissue accession GN10040 ), female 470 mm TL, Da-xi, 14 Mar 2012 ; CAS 236062 (tissue accession GN10062 ), female 707 mm TL, Nan-fang-ao, 14 Mar 2012 .

Remarks: One of the most abundant sharks in coastal fisheries around Taiwan and an important food fish. Postnatal specimens superficially similar to H. complicofasciata thus some early records could possibly be of the latter species.

Conservation status: Least Concern.