Medical Definition of ARTHRODESIS. : the surgical immobilization of a joint so that the bones grow solidly together: artificial ankylosis. the surgical immobilization of a joint so that the bones grow solidly together. ADVERTISEMENT.
Trapdoor spiders are not particularly harmful to man however, like Tarantulas, the tiny hairs on the legs of some species leave tiny red marks where the toothed hairs on the spiders' feet have clung to the skin. Mouse spiders are also a type of Trapdoor spider with huge chelicerae and may measure up to 35mm in body length.
Venom toxicity-the bite of these spiders is of low risk to humans. Spider Identification-are common outdoors and are occasionally found indoors. They are generally brownish or grayish with light and dark stripes near the head.They have long spinnerets and are moderate-sized (3/4 inch long).enom toxicity-the bite of these spiders is of low risk to humans. Spider Identification-are common outdoors and are occasionally found indoors. They are generally brownish or grayish with light and dark stripes near the head. They have long spinnerets and are moderate-sized (3/4 inch long).