Stolephorus, Lacepede, 1803

Yamamoto, Takumi, Nakamura, Takashi & Toda, Mamoru, 2022, Fig. 4 in Verification of Natural Marking for Individual Identification Using a Duplex Marking Approach in Ijima's Sea Snakes, (Reptilia: Elapidae)., Zoological Studies 61 (58), pp. 1-16 : 12

Key to species of Stolephorus with a predorsal scute and spine on the pelvic scute

1a. Gill rakers few, upper, lower, and total gill rakers on first gill arch usually fewer than 20, 25, and 44, respectively ......................... 2

1b. Gill rakers numerous, upper, lower and total gill rakers on first gill arch more than 18, 24, and 43, respectively ........................ 3

2a. Paired dark lines on dorsum from occiput to dorsal-fin origin (rarely absent); depressed pelvic fin posteriorly not reaching to vertical through dorsal-fin origin; gill rakers few, lower gill rakers on first gill arch 18–22 ........................................................ ................................... S. tri ( Singapore, Malaysia, and Indonesia)

2b. No dark lines on dorsum anterior to dorsal fin; posterior tip of depressed pelvic fin reaching to vertical through third to fifth dorsal-fin ray base; lower gill rakers on first gill arch 21–24 ........ ................ S. baganensis (Andaman coast of Thailand to Borneo)

3a. Pelvic fin short, 9.5–10.8 % SL, its posterior tip not reaching to vertical through dorsal-fin origin (rarely reaching to vertical through first or second dorsal-fin ray base); pectoral fin short, 15.6–17.4 % SL ......... S. dubiosus (southern Vietnam to Borneo)

3b. Pelvic fin long, 11.6–12.7 % SL, its posterior tip reaching to vertical through third to fifth dorsal-fin ray base; pectoral fin long, 17.8–18.7 % SL .......................... S. taurus (Bay of Bengal)