Viperidae, Oppel, 1811

Weinell, Jeffrey L., Hooper, Errol, Leviton, Alan E. & Brown, Rafe M., 2019, Illustrated Key to the Snakes of the Philippines, Proceedings of the California Academy of Sciences 66 (1), pp. 1-49 : 16

Viperidae

Key to Philippine genera.

1a. Some scales on head strongly keeled ( Fig. 24a ); second supralabial scale not in contact with scale forming anterior border of heat sensing pit................... Tropidolaemus (p. 34)

1b. Scales on head smooth ( Fig. 24b ); second supralabial scale in contact with scale forming anterior border of heat sensing pit................................... Trimeresurus (p. 34)

Figures

FIGURE 24. Ventral-lateral view of head of (A) Tropidolaemus subannulatus (KU 327425), (B) Trimeresurus flavomaculatus (KU 330050). Second supralabial scale (purplish-gray), scale anterior to heat sensing pit (green).