Tetrapulmonata

Tetrapulmonata Temporal range: Devonian–Holocene PreꞒ Ꞓ O S D C P T J K Pg N
Clockwise from top left: Araneus diadematus (Araneae) Phrynus (Amblypygi) Hubbardia briggsi (Schizomida) Mastigoproctus scabrosus (Uropygi)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Clade:	Arachnopulmonata
Clade:	Pantetrapulmonata
Clade:	Tetrapulmonata Shultz, 1990
Orders
Schizotarsata †Haptopoda (extinct) Pedipalpi Amblypygi – whip spiders Schizomida – short-tailed whipscorpions Uropygi – whip scorpions, vinegaroons †Xenarachne Serikodiastida †Uraraneida (extinct) †Idmonarachne Araneida †Chimerarachnida Araneae – spiders

Tetrapulmonata is a non-ranked supra-ordinal clade of arachnids. It is composed of the extant orders Uropygi (whip scorpions), Schizomida (short-tailed whip scorpions), Amblypygi (tail-less whip scorpions) and Araneae (spiders). It is the only supra-ordinal group of arachnids that is strongly supported in molecular phylogenetic studies.^[1] Two extinct orders are also placed in this clade, Haptopoda and Uraraneida.^[2] In 2016, a newly described fossil arachnid, Idmonarachne, was also included in the Tetrapulmonata; as of March 2016^[update] it has not been assigned to an order.^[3]