Pancrustacea

Pancrustacea; Temporal range:
	Sally Lightfoot crab (Grapsus grapsus).
	Fruit fly (Drosophila melanogaster).
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Pancrustacea; Zrzavý & Štys, 1997
Superclasses and extinct orders
	Allotriocarida (including Hexapoda); †Cambrocaris?; †Ercaia; †Hymenocarina?; Multicrustacea; Oligostraca; †Phosphatocopina?; †Skaracarida?; †Thylacocephala?; †Wujicaris; †Yicaris;
Synonyms
	Tetraconata Dohle, 2001

Pancrustacea is the clade that comprises all crustaceans, including hexapods (insects and relatives). This grouping is contrary to the Atelocerata hypothesis, in which Hexapoda and Myriapoda are sister taxa, and Crustacea are only more distantly related. As of 2010, the Pancrustacea taxon was considered well accepted, with most studies recovering Hexapoda within Crustacea. The clade has also been called Tetraconata, referring to having four cone cells in the ommatidia. This name is preferred by some scientists as a means of avoiding confusion with the use of "pan-" to indicate a clade that includes a crown group and all of its stem group representatives.

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