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The Detoxification of Ant (Pogonomyrmex) Venom by a Blood Factor in Horned Lizards (Phrynosoma)
Patricia J. Schmidt, Wade C. Sherbrooke and Justin O. Schmidt
Vol. 1989, No. 3 (Aug. 8, 1989), pp. 603-607
Stable URL: http://www.jstor.org/stable/1445486
Page Count: 5
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Horned lizards (Phrynosoma) are major predators of harvester ants (Pogonomyrmex). The lethal dose ( LD50) of Pogonomyrmex maricopa venom to mice, to Sceloporus jarrovii and to Phrynosoma cornutum is 0.119, 28 and 162 μg venom/g, respectively. Mice injected with 2.5 times an LD50 dose (to mice) of P. maricopa venom plus either 0.81 or 1.71 μl of Ph. cornutum plasma/g mouse survived without symptoms of envenomation, whereas mice injected with either S. jarrovii (0.34, 0.71, 1.51 or 3.14 μl/g) or Lampropeltis getulus (0.83 or 1.67 μl/g) plasma plus venom all died. Horned lizards possess a factor in their plasma that makes them resistant to the venom of P. maricopa.