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Trimeresurus barati REGENASS & KRAMER, 1981

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Higher TaxaViperidae, Crotalinae, Colubroidea, Alethinophidia, Serpentes, Squamata (snakes) 
Common NamesE: Barat Bamboo pitviper 
SynonymTrimeresurus popeiorum barati REGENASS & KRAMER 1981
Trimeresurus popeorum barati REGENASS & KRAMER 1981
Trimeresurus gramineus barati — WELCH 1988
Trimeresurus popeorum barati — GOLAY et al. 1993
Coluber gramineus — RAFFLES 1822 (nec Coluber gramineus SHAW 1802)
Trimeresurus gramineus — CANTOR 1847 (nec Coluber gramineus SHAW 1802)
Lachesis gramineus — BOULENGER 1896 (nec Coluber gramineus SHAW 1802) (partim)
Trimeresurus gramineus gramineus — KOPSTEIN 1938 (nec Coluber gramineus SHAW 1802)
Trimeresurus popeorum SMITH 1937 (partim) — SMITH 1943: 518
Trimeresurus gramineus barati — WELCH 1994: 115
Trimeresurus popeiorum barati — GUMPRECHT et al. 2004
Trimeresurus barati — VOGEL et al. 2004
Trimeresurus barati — GRISMER et al. 2006
Popeia popeiorum barati — SANDERS et al. 2006
Trimeresurus barati — DAVID et al. 2009
Trimeresurus (Popeia) barati — DAVID et al. 2011
Popeia barati — WALLACH et al. 2014: 575 
DistributionIndonesia (Mentawai Archipelago, Sumatra, Sumatera Barat, Riau and Benkulu, perhaps also Sipora and Siberut Islands); Type locality: “Solok, Sumatra”, now Solok, Sumatera Barat Province, Sumatra Island, Indonesia. Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
TypesHolotype: NMBA (= NHMB) 2587 

T. barati is diagnosed as follows according to VOGEL et al. 2004:

Diagnosis. —A species of the genus Trimeresurus, endemic to Sumatra Island, char-acterized by the following points: (1) hemipenes long, smooth, without spines; (2) 1 st supralabial distinct from nasal; (3) 19 MSR (rarely 17); (4) overall green coloration in males and females, without crossbands; (5) postocular streak absent in males and females; (6) in males a ventrolateral stripe, reddish-brown below / white above, absent in females; (7) tail green, rusty-red above, slightly mottled with green laterally but with a definite bor-der between the red and green colours; (8) VEN: 142–158; SC: 55–73; (8) tail long in males, with a ratio TaL/TL of 0.194–0.231, and in females, 0.164–0.176.

Comparison with other species. —Trimeresurus barati differs from all other pitvi-pers of the Trimeresurus popeiorum complex by the combination of the following charac-ters: (1) the number of MSR, usually 19; (2) tail with a definite border between the red and green colours; (3) postocular streak absent in males and females; (4) a weak ventrolateral stripe, bicolor reddish-brown below and white above or only white in males, absent in females; (5) a smaller size; (6) a low number of VEN in males and females; (7) occipital and temporal scales smooth or weakly keeled; (8) the pattern of the tail. Main characters separating Trimeresurus barati from other species of the group are given in Tables 12–13. From T. popeiorum, it differs by: (1) a smaller size; (2) the lack of postocular streak in males; (3) the lack of ventrolateral stripe in females; (4) the number of MSR; (5) a lower number of ventrals in females (146–158 vs. 154–168 in T. popeiorum); (6) occipital and temporal scales much more weakly keeled; (7) by the higher value for TaL/TL in males, although with a wide overlap in the ranges (see Table 12); (8) the pattern of the tail. Trimeresurus barati differs from Trimeresurus fucatus by (1) a smaller size in T. barati; (2) the number of MSR (17–19 vs. 21 in T. fucatus); (3) the lack of dorsal cross-bands in T. barati; (4) the lack of a ventrolateral stripe in females of T. barat i ; (6) the pat-tern of the tail; (7) by a higher number of VEN in both sexes of T. f ucat us (males: 156–171 727 [x = 164.0, s = 3.5] vs. in T. barati 142–153 [x = 148.3, s = 3.3]; in females: 157–170 in T. fucatus [x = 163.5, s = 3.4] vs. in T. barati 146–158 [x = 149.8, s = 4.3]); (8) a higher num-ber of SC in males and especially in females of T. f ucat us (59–73 [x = 63.8, s = 3.6] vs. in T. barati 55–59 [x = 57.2, s = 1.6]); (9) occipital and temporal scales much more weakly keeled or smooth in T. barati; (10) the pattern of the tail. Trimeresurus barati differs from T. sabahi by: (1) the number of MSR; (2) a smaller size; (3) the presence of a white or yellow ventrolateral stripe in females of T. sabahi, absent in T. barat i ; (4) the colour of the eyes, orange or yellow in T. barati vs. red or orange-red in T. sabahi; (5) a slightly lower ratio TaL/TL in females (0.164–0.176 [x = 0.172, s = 0.005] vs. 0.173–0.178 [x = 0.176, s = 0.003] in T. sabahi; U = 1; P < 0.05); (6) a lower number of SC in females (55–59 [x = 57.2, s = 1.5] vs. 59–65 [x = 62.2, s = 2.7] in T. sabahi); (7) by the contact of the 3 rd SL with the SubOC, usually in contact in both sexes of T. barati (in 31/34 total occurrences [left + right sides], vs. in contact in only 8/20 occurrences in T. sabahi and separated by 1 scale in the three examined females; (8) the pattern of the tail.

For abbreviations see T. nebularis. 
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