Platyrhina

Iwatsuki, Yukio, Miyamoto, Kei, Nakaya, Kazuhiro & Zhang, Jie, 2011, A review of the genus Platyrhina (Chondrichthys: Platyrhinidae) from the northwestern Pacific, with descriptions of two new species, Zootaxa 2738, pp. 26-40 : 27

Key to species of Platyrhina from the northwestern Pacific

1a. 1 row of hooked thorns on mid-dorsum of tail............................................................... 2

1b. 2 (rarely 3 irregular rows anteriorly) rows of hooked thorns on mid-dorsum of tail........................... P. sinensis

2a. Hooked thorns on orbital, nape and scapular regions not encircled by light yellow or white pigment ( Fig. 2 A–B); a pair of thorns anteriorly on scapular region ( Fig. 3 B, indicated by white arrows).................................................................................................. P. hyugaensis Iwatsuki, Miyamoto and Nakaya sp. nov.

2b. Hooked thorns on orbital, nape and scapular regions encircled by light yellow or white pigment ( Fig. 2 C–D); a pair of thorns absent anteriorly on scapular region ( Fig. 3 E)........................... P. ta n g i Iwatsuki, Zhang and Nakaya sp. nov.

Figures

FIGURE 2. Three species of Platyrhina and close up of tail for each species. A – C) Platyrhina sinensis, D – F) P. hyugaensis sp. nov. and G – I) P. tangi sp. nov. A) ASIZB 182251, male, 350 mm TL, off Amoy, China; B) ASIZB 182256, female, 455 mm TL, off Amoy, China; C) Same specimen of (A), close up of tail; D) MUFS 21609 (holotype), male, 391 mm TL, Meitsu, Miyazaki, Japan; E) MUFS 23164 (paratype), female, 431 mm TL, Meitsu, Miyazaki, Japan; F) Same specimen of (D), close up of tail; G) MUFS 23163 (holotype), male, 398 mm TL, Meitsu, Miyazaki, Japan; H) KPM-NI 2488 (paratype), female, 434 mm TL, Mera, Shizuoka, Japan; I) Same specimen of (G), close up of tail.

FIGURE 3. Differences between A – C) Platyrhina hyugaensis sp. nov. and D – F) P. t a n g i sp. nov.; A – C) MUFS 23164 (holotype), female, 431 mm TL, Meitsu, Miyazaki, Japan; D – F) KPM-NI 2488 (paratype), female, 434 mm TL, Mera, Shizuoka, Japan. White and black arrows show a pair of thorns on the anterior part of scapular region and subsequent irregular small thorns on two pairs of two (total eight) symmetrical thorns, respectively.