Arthrodira

Arthrodira; Temporal range: Devonian,
	Artist's reconstruction of the arthrodire placoderm Dunkleosteus terrelli
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Gnathostomata
Class:	†Placodermi
Order:	†Arthrodira; Woodward, 1891
Subgroups
	Phlyctaenioidei Brachythoraci; Williamsaspididae; Groenlandaspididae; Arctolepididae; Phlyctaeniidae; ; Actinolepidae; Phyllolepida; Wuttagoonaspidae; Genera incertae sedis see text for list; ;

Arthrodira (Greek for "jointed neck") is an order of extinct armored, jawed fishes of the class Placodermi that flourished in the Devonian period before their sudden extinction, surviving for about 50 million years and penetrating most marine ecological niches. Arthrodires were the largest and most diverse of all groups of placoderms.

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