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Infraorder Mygalomorphae - Mygalomorphs

Aphonopelma hentzi - Texas Brown Tarantula? - Aphonopelma Black Spider  - Ummidia California Tarantula, Aphonopelma spp - Aphonopelma - male Texas Spider, Black, Hairy, Large. - Eucteniza relata please help me identify this spider. - Myrmekiaphila comstocki Spider sp. - Aptostichus Euctenizidae? - Ummidia Tarantula ID Request
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Mygalomorphae (Mygalomorphs)
Numbers
over 2,500 spp. in 280 genera placed in 15 families worldwide(1)
Identification
Easily distinguished from araneomorphs by two pairs of booklungs; fangs and chelicerae are parallel to the body axis.

In North America, the only mygalomorphs that have claw tufts are the tarantulas (family Theraphosidae).
Remarks
This is a more primitive group of spiders which includes the infamous tarantulas, primarily represented by members of Family Theraphosidae. Other familiar members include the trapdoor spiders and purseweb spiders.