Yellow Sac Spider 

The yellow sac spider, also known as Cheiracanthium Inclusum, is a yellow species of spider in the family Cheiracanthiidae. In general, the body of both females and males can measure between five to ten mm (0.20 to 0.39 in). Researchers say that this species of spiders can be found all over the world. They are often confused with house spiders and are rarely seen because they are quite small. 

The bite of the yellow sac spider is really painful, and the venom contains a substance called cytotoxin, which can damage the functions of the cells, usually leading to cell death. However, studies have shown that the venom of the yellow sac spider can’t cause death in humans, but it can cause necrosis, pain, swelling and lesions in the affected area.