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.
Grass Spiders, like most spiders, inject their prey with venom. However, their venom cannot be injected to humans by a bite due to their very small chelicerae which is not large or prominent enough to pierce human skin.Their venom is not medically important for humans.For small insects and other prey of this spider though, their venom is very deadly.owever, Grass Spiders or Funnel Weavers are easy to distinguish from Wolf Spiders because Wolfs do not construct webs but rather hunts for prey actively. The Spider is also known as Funnel Weaver Spider because of the shape of their webs.