Dekatriata

Dekatriata; Temporal range: Middle Ordovician – present,
	Eurypterus remipes, a eurypterid
	Araneus diadematus, an arachnid
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Clade:	Planaterga
Clade:	Dekatriata; Lamsdell, 2013
Groups
	†Houia; †Winneshiekia; †Chasmataspidida; Sclerophorata Arachnida; †Eurypterida; ;

Dekatriata is a clade of planatergan chelicerates including the groups Arachnida, Chasmataspidida, Eurypterida and additionally two stem-genera Winneshiekia and Houia. Dekatriata is defined by an opisthosoma with 13 segments as groundplan (the number proposed to be secondarily reduced in most arachnid orders) and fused, plate-like appendages on the first opisthosomal segment (somite VII).

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