Eurypterida

Synonyms: Cyrtoctenida Stoermer and Waterston 1968, Gigantostraca Haeckel 1896

Parent taxon: Chelicerata according to J. C. Lamsdell 2025

See also Bergström 1968, Dunlop et al. 2020, Lamsdell 2013, Sepkoski 2002 and Størmer 1955

Sister taxa: Euchelicerata, Gumatagichnus, Habeliida, Limulus nathorsti, Mollisoniida, Offacolidae, Sanctacaris

Subtaxa: Belinuropsis Belinuropsis wigudensis Eurypteracea Eurypterella Eurypterella ornata Eurypterina Marsupipterus Parahughmillera Stylonuracea Stylonurina

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Ecology: nektobenthic carnivore

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