Abstract
Biochemical and biological activities of a venom sample from a recently discovered new genus and species of pitviper from Vietnam, Triceratolepidophis sieversorum, were assayed and compared with those of five other viperid snakes ( Bothrops asper, Crotalus atrox, Protobothrops flavoviridis, Trimeresurus insularis, and Vipera ammodytes). The venom had high casein hydrolysis, arginine ester hydrolysis and haemorrhagic activities, lacked measurable phosphodiesterase and l-amino acid oxidase activities, and had no procoagulant activity on either bovine fibrinogen or human plasma. Other enzymatic activities (phospholipase A 2, kallikrein) were moderate. The approximate i.p. LD 50 (mice) of the venom is about 5–6 mg/kg.
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