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Infraorder Mygalomorphae - Mygalomorphs

Foldingdoor spider - Antrodiaetus - female Trapdoor spiderlings Antrodiaetus riversi unknown spider - Antrodiaetus Tube-Trapdoor Spider, Amador county - Calisoga Large Black Spider - Ummidia What type of spider is this? Tarantula
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Mygalomorphae (Mygalomorphs)
Remarks
This is a more primitive group of spiders which includes the infamous tarantulas, primarily represented by members of Family Theraphosidae.
Some other familiar members include the trapdoor spiders and purseweb spiders.
Mygalomorphs are easily distinguished from Araneomorphs by two pairs or four booklungs.
Their fangs and chelicerae are parallel to the axis of the body.