Distribution
According to McDiarmid et al. ''P. fieldi'' is found in the Sinai Peninsula, Israel, Jordan, northern Saudi Arabia, northwestern Iraq, and possibly in southern Syria.The type locality given in the original description is "Bair Wells, Transjordania" [Jordan].
According to Mallow et al. it is found in the Sinai Peninsula, southern Israel, Jordan, extreme northern Saudi Arabia, and southwestern Iraq.
Defense
There is a more pronounced difference between the two subspecies with regard to their venom. While Persian horned viper venom exhibits strong hemorrhagic activity typical of most vipers, the venom of ''P. fieldi'' is unusual in that contains several fractions that show marked neurotoxic activity. No antivenin is available for bites from either subspecies. It is reported that a polyvalent antiserum does offer some protection from the hemotoxins, but none against the neurotoxic effects of ''P. fieldi'' venom.References:
Some text fragments are auto parsed from Wikipedia.
