Developmental biology of the Brazilian 'Armed' spider Phoneutria nigriventer (Keyserling, 1891): microanatomical and molecular analysis of the embryonic stages.

Phoneutria (Ctenidae) is among the most dangerous venomous spiders in Brazil. Its venom is composed of a mixture of pharmacologically active components, some of which have been quite extensively studied due to their potentiality as models for new pharmaceutical drugs. Nevertheless, literature data on the venom-producing glands are very limited.