Tube-Dwelling Spiders (Segestriidae)

The family of tube-dwelling spiders, Segestriidae, comprises around 180 species worldwide. They are predominantly small to medium-sized spiders that have only six eyes (which you might only see at a second glance, Fig. 4.9), have a cylindrical body structure, and betray themselves through a characteristic leg position. Three pairs of legs are directed forward, with only one pair toward the back (Fig. 21.1). Especially when the animals are in their retreat and waiting for passing prey, it is remarkable to see these six legs. With this lurking position, a prey animal can probably be caught faster or more securely than if only four legs were stretched forward. However, this would still need to be scientifically tested.