Platyrhina

White, William T. & Last, Peter R., 2016, Platyrhina psomadakisi sp. nov., a new species of fanray (Batoidea: Platyrhinidae) from the Andaman Sea, the first record of this family in the Indian Ocean, Zootaxa 4121 (5), pp. 533-544 : 543

Key to species of Platyrhina (adapted from Iwatsuki et al., 2011)

1a. Two (rarely 3 irregular rows anteriorly) rows of hooked thorns on mid-dorsum of tail....... P. s i n e n s is (North-West Pacific)

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

2a. Hooked thorns on orbital, nape and scapular regions encircled by light yellow or white pigment; a pair of thorns absent anteri- orly on scapular region.......................................................... P. ta n g i (North-West Pacific)

2b. Hooked thorns on orbital, nape and scapular regions not encircled by light yellow or white pigment; a pair of thorns anteriorly on scapular region..................................................................................... 3

3a. Distance between dorsal fins (first dorsal-fin insertion to second dorsal origin) subequal to mouth width (8.5–9.1% TL); body and tail brown with faint darker brown bands................................ P. psomadakisi sp. nov. (Andaman Sea)

3b. Distance between dorsal fins (first dorsal-fin insertion to second dorsal origin) much shorter than width of mouth (6–7% TL); body without bands......................................................... P. hyugaensis (North-West Pacific)