Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes


TaxonomyBrowse
Info
ImagesLinksBooksData

Infraorder Mygalomorphae - Mygalomorphs

Ummidia - male Tarantula?? - Calisoga Aptostichus simus - female Trapdoor Spider - Myrmekiaphila - female Purseweb spiderlings Male trapdoor - Aptostichus stanfordianus - male Tarantula on Marcus Landslide Trail Antrodiaetus Pacificus, Lake Coeur d'Alene, Idaho - Antrodiaetus pacificus - male
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.