Pygostylia

Pygostylians; Temporal range: ; Early Cretaceous–Present,
	Fossil pygostylian (Confuciusornis sanctus)
	House sparrow (Passer domesticus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Clade:	Avialae
Clade:	Avebrevicauda; Paul, 2002
Clade:	Pygostylia; Paul, 2002
Subgroups
	†Confuciusornithidae; †Jinguofortisidae; †Omnivoropterygidae?; Ornithothoraces;

Pygostylia is a group of avialans which includes the Confuciusornithidae and all of the more advanced species, the Ornithothoraces.

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Pygostylians Temporal range: Early Cretaceous–Present,

Fossil pygostylian (Confuciusornis sanctus)

House sparrow (Passer domesticus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Clade:	Avialae
Clade:	Avebrevicauda Paul, 2002
Clade:	Pygostylia Paul, 2002
Subgroups^[1]
†Confuciusornithidae †Jinguofortisidae †Omnivoropterygidae? Ornithothoraces