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Trimeresurus sabahi REGENASS & KRAMER, 1981

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Higher TaxaViperidae, Crotalinae, Colubroidea, Alethinophidia, Serpentes, Squamata (snakes) 
Common NamesE: Sabah Bamboo pitviper 
SynonymTrimeresurus popeiorum sabahi REGENASS & KRAMER 1981
Trimeresurus gramineus sabahi — WELCH 1994: 115
Trimeresurus popeiorum — MANTHEY & GROSSMANN 1997: 409
Trimeresurus popeiorum sabahi — MALKMUS et al. 2002
Trimeresurus popeiorum sabahi — GUMPRECHT et al. 2004
Trimeresurus sabahi — VOGEL et al. 2004
Popeia sabahi — CREER et al. 2006
Popeia sabahi — SANDERS et al. 2006
Trimeresurus sabahi — DAVID et al. 2009
Trimeresurus (Popeia) sabahi — DAVID et al. 2011
Popeia sabahi — WALLACH et al. 2014: 576 
DistributionEast Malaysia (Borneo: Sabah, Sarawak); Indonesia ? (Kalimantan questionable)

Type locality: “Mount Kinabalu, Kulapis River, British North Borneo”  
TypesHolotype: MCZ 43608 

VOGEL et al. 2004 gave the following diagnosis for T. sabahi:

Diagnosis. —A species of the genus Trimeresurus, endemic to Borneo Island, charac-terized by the following points: (1) hemipenes long, smooth, without spines; (2) 1 st supralabial distinct from nasal; (3) 21 DSR at midbody, moderately keeled; (4) overall green coloration in males and females, without crossbands; (5) postocular streak absent in males and females; (6) a bicolor ventrolateral stripe present in males, red or rusty-red below, white above; in females, the stripe is white of yellow; (7) eyes bright or deep red or deep orange in males and females, orange, yellowish-copper or yellowish-green in juve-nile specimens; (8) tail sides green, widely mottled with rusty brown, with a sharp border between the colours; (9) tail long in males and females, with a ratio TaL/TL of 0.186– 0.238, and 0.173–0.178 respectively; (10) VEN: 147–157; SC: 59–76; (11) Occipital and temporal scales smooth or very weakly keeled.

Comparison with other species. — Trimeresurus sabahi differs from all other pitvi-pers of the Trimeresurus popeiorum complex mostly by the combination of the following characters:(1) the eye colour, red or orange-red in both males and females; (2) no postocu-lar streak in males and females; (4) a bicolor ventrolateral stripe in males, red below/white above, only white or yellow in females; (5) a low ventral count in males and females; (6) occipital and temporal scales smooth or very weakly keeled. Main characters separating Trimeresurus sabahi from other taxa of the group are given in Tables 12–13. T. sabahi differs from T. popeiorum by (1) a smaller size; (2) by the absence of postocular streaks in both sexes; (3) a lower number of Cep between the supraoculars (9–11 [x = 10.3, s = 0.8] vs. in T. popeiorum 10–14 [x = 11.5, s = 1.0]; U = 45.5; P < 0.05)]); (4) a lower number of VEN in females (148–156 vs. 154–168 in T. popeiorum); (5) occipital and temporal scales smooth, vs. distinctly or strongly keeled in T. popeiorum. Trimeresurus sabahi differs from T. fucatus by (1) a smaller size; (2) the absence of dorsal crossbands in T. sabahi; (3) the colour of the eyes in males and females (red in T. sabahi vs. yellowish-green or gold or copper in T. fucat us); (4) the absence of vertebral white spots in T. sabahi, although, according to Stuebing & Inger (1999), white dots are sometimes present; (5) the tail pattern; (6) a higher number of ventral scales in both sexes of T. f ucat us (in males 156–171 [x = 164.0, s = 3.5] vs. 147–157 [x = 151.6, s = 2.8] in T. sabahi; U = 1.5; P < 0.001; in females 157–170 [x = 163.5, s = 3.4] vs. in T. sabahi 148– 156 [x = 152.2, s = 3.0]); (7) by weakly keeled or smooth occipital and temporal scales in T. sabahi, strongly keeled in T. f ucatus.

For abbreviations see T. nebularis. 
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