They are related to the Atypidae (atypical tarantulas).

The atypical tarantulas or purseweb spiders (family Atypidae) consist of only three genera.

Atypical tarantulas have huge chelicerae for their size and relatively long spinnerets (although not as long as those found in diplurids).

The name "tarantula" is also mistakenly applied to other large-bodied spiders, including the purseweb spiders or atypical tarantulas, the funnel-webs (Dipluridae and Hexathelidae), and the "dwarf tarantulas".

The leg structure appears to be an adaptation for living in silken tubes, which unlike those of the atypical tarantulas, may branch and are often built in tree bark fissures, as well as under stones.

The atypical tarantulas or purseweb spiders (family Atypidae) consist of only three genera.

These tubes are used to detect prey, such as Coelus globosus, when they cross the tube, similar to the hunting style of purseweb spiders.

Purseweb spiders are accomplished ambush predators that spend most of their time in a sock-like, silken retreat on the ground from where they kill their prey.

The name "tarantula" is also mistakenly applied to other large-bodied spiders, including the purseweb spiders or atypical tarantulas, the funnel-webs (Dipluridae and Hexathelidae), and the "dwarf tarantulas".

Atypus piceus is a mygalomorph spider of the Atypidae family.

Sphodros atlanticus is a species of Mygalomorph from the family Atypidae.

They are related to the Atypidae (atypical tarantulas).

The 'atypical tarantulas' or 'purseweb spiders' (family 'Atypidae') consist of only three genus.

A revision of the American spiders of the family Atypidae (Araneae, Mygalomorphae).

Atypoidea (Antrodiaetidae and Atypidae)

These are of the families Atypidae, Nemesiidae, Ctenizidae, Hexathelidae, Theraphosidae and Cyrtaucheniidae, together with only a dozen species.

Sphodros abboti also known as Purseweb spider, is a species of spiders from a family of Atypidae, that can only be found in Florida, United States.