Snake venom endo-hyaluronidase that degrades hyaluronan to smaller oligosaccharide fragments. In venom, it is not toxic by itself, but increases the diffusion of other venom proteins such as crotoxin (a neurotoxic and myotoxic PLA2) by degrading the extracellular matrix. In addition, it displays antiedematogenic activity, since it significantly diminishes the oedematogenic activity of crotoxin (probably by direct substrate hydrolysis, since hyaluronan possesses strong water-binding capacity). Random hydrolysis of (1->4)-linkages between N-acetyl-beta-D-glucosamine and D-glucuronate residues in hyaluronate. Optimum pH is 5.5. Optimum temperature is 37 degrees Celsius. Monomer. Expressed by the venom gland. Contains disulfide bonds. Glycosylated. Belongs to the glycosyl hydrolase 56 family.