over 2,500 spp. in 280 genera placed in 15 families worldwide(1)
8 mygalomorph families found in US + Canada
Distinguished from almost all North American araneomorphs by two pairs of booklungs (visible as "white patches" on ventral side of abdomen in live specimens).
Fangs and chelicerae are parallel to the body axis.
In North America, the only mygalomorphs that have claw tufts are the tarantulas (family Theraphosidae).
Includes the tarantulas, represented by members of Family Theraphosidae
. Other familiar members include the trapdoor spiders and purseweb spiders.
Bond et al 2012 A Reconsideration of the Classification of the Spider Infraorder Mygalomorphae (Arachnida: Araneae) Based on Three Nuclear Genes and Morphology (online PDF