Tetrapulmonata

Tetrapulmonata; Temporal range:
	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. Two extinct orders are also placed in this clade, Haptopoda and Uraraneida. In 2016, a newly described fossil arachnid, Idmonarachne, was also included in the Tetrapulmonata; as of March 2016 it has not been assigned to an order.

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