Clade Sclerophorata Kamenz et al. 2011 (arthropod)

Xiphosura - Xiphosurida

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

Sister taxon: Chasmataspidida

Subtaxa: Arachnida Eurypterida

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Ecology: nektobenthic carnivore

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