Thrombin-like snake venom serine protease that displays clotting activity on fibrinogen. Shows both arginine-ester hydrolase and amidase activities on synthetic substrates. Also shows proteolytic activity toward casein. Selective cleavage of Arg-|-Xaa bond in fibrinogen, to form fibrin, and release fibrinopeptide A. The specificity of further degradation of fibrinogen varies with species origin of the enzyme. Homodimer. Expressed by the venom gland. Belongs to the peptidase S1 family. Snake venom subfamily.