Cyclocorus, A.M.C.Duméril, 1853

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 : 22-23

Cyclocorus

Key to Philippine species and subspecies.

1a. Ventral body scales> 137; hemipenes narrow, elongate with minute spines ornamenting walls; usually eight supralabial scales, three bordering eye; usually two anterior temporal scales ( Fig. 32A ); prominent white spots present along lateral edge of ventral body scales; many dark, usually triangularly-shaped, blotches on ventral body scales............................. 2

1b. Ventral body scales <136; hemipenes robust, inner walls uniformly spinose, spines of moderate size; supralabial scales 7–8, two or three bordering eye; anterior temporal scale usually one ( Fig. 32B ); white spots along lateral edge of ventral body scales, if present, obscure; few or no dark triangular blotches on ventral body scales..................................... 3

2a. Tail length/total length 0.295 –0.371 (males), 0.196 –0.262 (females); subcaudals 52–59 (males), 42–48 (females); white spots along lateral edge of ventral body scales prominent................................................................ Cyclocorus lineatus lineatus

2b. Tail length/total length 0.235 –0.296 (males), 0.152 –0.223 (females); subcaudal scales 42–53 (males), 33–44 (females); white spots along lateral edge of ventral body scales very small......................................................... Cyclocorus lineatus alcalai

3a. Usually seven supralabial scales, two bordering eye.......... Cyclocorus nuchalis nuchalis

3b. Usually eight supralabial scales, three bordering eye.......... Cyclocorus nuchalis taylori

Figures

FIGURE 32. Lateral view of head of (A) Cyclocorus lineatus alcalai (KU 324539), (B) Cyclocorus nuchalis taylori (KU 344152). Anterior temporal scales (green).