Chaenogaleus Gill, 1862

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 : 326-327

Genus Chaenogaleus Gill, 1862

Hooktooth Shark / Ȁǿḛé

Chaenogaleus Gill, 1862: 400 , 402. Type species: Hemigaleus macrostoma Bleeker, 1852 , by original designation (also by monotypy).

Chaenogaleus macrostoma ( Bleeker, 1852)

Hooktooth Shark / λRṪỄắ

Hemigaleus macrostoma Bleeker, 1852: 46 , pl. 2, fig. 10. Syntype: BMNH 1867.11 .28.197, male 699 mm TL, Jakarta and Semarang, Java, Indonesia .

Local synonymy: Hemigaleus balfouri: Nakamura, 1936: 71 , 52 (Keelung); Matsubara, 1936b: 24, pl. 15, fig. 1 (Keelung); Chen, 1948: 33; Chen, 1956: 19; Shen, 1984a: 61, fig. Hemigaleus macrostoma: Nakamura, 1936: 33 , pl. 14, fig. 2; Matsubara, 1936b: 70, fig. 51 (Java and Formosa); Chen, 1948: 33; Chen, 1956: 19; Shen, 1984a: 62, fig. Negogaleus balfouri: Matsubara, 1955: 119 ; Teng, 1962: 117; Chen, 1963: 72, fig. 21 (THUP 1772); Chen & Yu, 1986: 139. Negogaleus macrostoma: Matsubara, 1955: 119 ; Teng, 1962: 116; Chen, 1963: 75, fig. 23? (THUP 0005); Chen & Yu, 1986: 140. Chaenogaleus macrostoma: Chen & Joung, 1993: 59 ; Shen & Wu, 2011: 67, fig.

Taiwan voucher material: (6 spec.) NMMB-P 4778 , Taichong, 1 Oct 1959 ; NMMB-P 6411 , Taichong, 20 Apr 1962 ; NMMB-P 6414-1 (1 of 2 spec.), Kaohsiung, 4 Aug 1965 ; NMMB-P 6444 , Taichong, 6 May 1962 ; NMMB- P 6446-1 (1 of 2 spec.), Taichong , 22 Feb 1962 ; NMMB-P 6447 , Taichong, 22 Feb 1962 .

Remarks: Drawing of N. macrostoma in Chen (1963) possibly not of this species but unclear as to the taxon involved without specimen examination. Appears to be quite rare in landings in Taiwanese waters. The synonymy of this species is complicated; Hemigaleus balfouri Day, 1878 is considered a junior synonym, but historically this name has been used for various hemigaleid species; the illustration of N. balfouri in Chen (1963) is clearly of C. macrostoma , but the illustration of H. macrostoma is not as clear; literature which refers to either N. balfouri and H. macrostoma have all been included in the synonym for this species, but it is possible that at least some of these literature records were misidentifications of another hemigaleid species. No, or very few, records in the last few decades suggesting this species may be largely extirpated from Taiwanese waters.

Conservation status: Vulnerable.