Hexatrygon Heemstra & Smith, 1980

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 : 358

Genus Hexatrygon Heemstra & Smith, 1980

Sixgill Stingray / ÁẪẽé

Hexatrygon Heemstra & Smith, 1980: 1 . Type by original designation (also monotypic).

Hexatrygon bickelli Heemstra & Smith, 1980

Sixgill Stingray / DzkÁẪẽ

Hexatrygon bickelli Heemstra & Smith, 1980: 6 , figs 1–13, 15. Holotype: SAIAB [formerly RUSI] 997, juvenile or nearadolescent female 1030 mm TL, 500 mm DW, washed up on beach at Port Elizabeth , South Africa, southwestern Indian Ocean, ca. 33°59.5' S, 25°40.7' E.

Local synonymy: Hexatrygon yangi: Shen & Liu, 1984: 201 , figs 1–11 (NTUM 6100, holotype, 1040 mm TL); Chen & Yu, 1986: 165; Chen & Joung, 1993: 82, pl. 11.9; Shen & Wu, 2011: 100, fig. Hexatrygon brevirostra: Shen, 1986a: 106 , figs. 1–3 (NTUM 6597, 621.4 mm TL); Chen & Joung, 1993: 81, pl. 11.7; Shen & Wu, 2011: 99, fig. Hexatrygon taiwanensis: Shen, 1986b: 175 , figs. 1–5 (NTUM 6505, 582 mm TL); Chen & Joung, 1993: 81, pl. 11.8; Shen & Wu, 2011: 99, fig. Hexatrygon bickelli: Shao et al., 2008: 237 ; Ho & Shao, 2011: 20.

Taiwan voucher material: (8 spec.) CAS 235428 , juvenile female 958 mm TL, Da-xi, 22 May 2005 ; CSIRO H 6292-19 , juvenile male 716 mm TL, Da-xi, 21 May 2005 ; UF 158752, juvenile male 546 mm TL, Da-xi, 25 May 2005 ; NMMB-P HO-243 , female 1176 mm TL, Dong-gang, 19 Mar 2012 .

Remarks: The ontogenetic changes and variations of snout length and shape with growth in this species caused the description of several species, but all are now considered as synonymous of H. bickelii .

Conservation status: Least Concern.