Yellow Sac Spiders " Cheiracanthium inclusum "

Cheiracanthium, commonly called yellow sac spiders, is a genus of araneomorph spiders in the Cheiracanthiidae family, and was first described by Carl Ludwig Koch in 1839. They are usually pale in colour, and have an abdomen that can range from yellow to beige. Both sexes range in size from 5 to 10 millimetres (0.20 to 0.39 in).

Cheiracanthium is primarily an Old World genus, with many species found from northern Europe to Japan, from Southern Africa to India and Australia. The only known species in the New World are C. inclusum and C. mildei. While the former also occurs in Africa and Réunion, the latter is found in the Holarctic region and Argentina. They can also be found in the lower mainland of British Columbia, Canada.

Though they are beneficial predators in agricultural fields, they are also known to be mildly venomous to humans. Painful bites may be incurred from species such as C. punctorium in Europe, C. mildei in Europe and North America, C. inclusum in the Americas, C. lawrencei in South Africa and C. japonicum in Japan.

 Cheiracanthium venom is purportedly necrotic, and can cause pain, swelling, and lesions in humans,, but the necrotic nature and severity of its bite has been disputed.