Euchelicerata

Full reference: J. C. Lamsdell. 2013. Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura. Zoological Journal of the Linnean Society 167:1-27

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

Sister taxa: Bembicosoma, Bunaia, Bunodes, Cyamocephalus, Pseudoniscus

Subtaxa: Chasmataspidida Sclerophorata

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Ecology:

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