Pseudorabdion, Jan, 1862

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 : 32-33

Pseudorabdion

Key to Philippine species.

1a. Loreal scale absent, prefrontal scale in contact with supralabial scales ( Fig. 43B–D )....... 2

1b. Loreal scale present, prefrontal scale not in contact with supralabial scales ( Fig. 43A )..... 4

2b. Frontal scale does not border eye; supraocular and postocular scales present, fused to each other ( Fig. 43C–D )................................................................ 3

2a. Frontal scale borders eye; supraocular scale absent ( Fig. 43B )........................ 6

3a. Parietal scale in contact with fourth and fifth supralabial scales ( Fig. 43C ); each scale of first dorsal body scale row has dark center and light edges; each ventral body scale dark brown, lighter along posterior edge; supraocular and postocular scales usually fused to eye; ventral body scales 132–144 (males), 144–157 (females); subcaudal scales 22–24 (males), 16–17 (females).................................................... Pseudorabdion oxycephalum

3b. Parietal scale in contact with fifth, but not fourth, supralabial scale ( Fig. 43D ); each scale of first dorsal body scale row has light center and dark edges; each ventral body scale whitish, with dark brown pigment confined to a broad transverse band; supraocular and postocular scales not fused to eye; ventral body scales 146–148 (males), 154–161 (females); subcaudal scales 28 (males), 21–24 (females).................................. Pseudorabdion montanum

4a. Light nuchal collar usually present; subcaudal scales 26–29 (males), 17–23 (females)............................................................ Pseudorabdion mcnamarae

4b. Light nuchal collar absent; subcaudal scales> 30 (males and females).................. 5

5a. Dorsal body scales uniform pale brown, each thinly edged with pigmentless border; distal portion of hemipenes calyculate, subcaudal scales 33–35 (females), 40 (males)...................................................................... Pseudorabdion taylori

5b. Dorsal body scales pale, centers and posterior tips nearly without pigment; anterior edge of each dorsal body scale with brown mottling; large areas of lateral portion of ventral body scales without pigment; distal portion of hemipenes minutely spinose; subcaudal scales 36–39 (males; unknown for females)..................................... Pseudorabdion talonuran

6a. Postocular scale absent (fused to ocular scale); maxillary teeth 10–12... Pseudorabdion ater

6b. Postocular scale present, not fused to ocular scale ( Fig. 43B ); maxillary teeth 22–25............................................................. Pseudorabdion cf. collaris

Figures

FIGURE 43. Lateral view of head of (A) Pseudorabdion mcnamarae (KU 327199), (B) Pseudorabdion cf. collaris (KU 315197), (C) Pseudorabdion oxycephalum (KU 324641), (D) Pseudorabdion montanum (KU 305063). Loreal scale (green; A), parietal scale (purplish-gray; C–D), fourth supralabial scale (light gray; C–D), postocular scale (blue; B), frontal scale (reddish brown; B–D), scale formed from fusion of supraocular and postocular scales (yellow; C–D).