Intersexual variations in the venom of the Brazilian 'armed' spider Phoneutria nigriventer (Keyserling, 1891).


Venom from male and female specimens of the medically most important Brazilian Ctenidae spider Phoneutria nigriventer (Keyserling, 1891) has been compared. Males showed a slightly higher venom yield (386 microg) than equal sized females (296 microg), while adult females showed nearly a three times higher venom yield (1079 microg). High-pressure liquid… (More)


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