†order Chasmataspidida Caster and Brooks 1956 (arthropod)

Euchelicerata - Chasmataspidida

Alternative spelling: Chasmataspidina

Synonym: Diploaspidida Simonetta and Delle Cave 1978

Parent taxon: Dekatriata according to J. C. Lamsdell 2013

See also Bergström 1968, Bergström 1975, Dunlop et al. 2003, Dunlop et al. 2020 and Sepkoski 2002

Sister taxon: Sclerophorata

Subtaxa: Chasmataspidacea Chasmataspididae Diploaspididae Heteroaspididae Kiaeria

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Ecology:

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