Clade Euchelicerata Weygoldt and Paulus 1979 (arthropod)
Parent taxon: Chelicerata according to J. C. Lamsdell 2013
See also Dunlop et al. 2003 and Dunlop et al. 2020
Sister taxa: Gumatagichnus, Habeliida, Limulus nathorsti, Mollisoniida, Offacolidae, Sanctacaris
Subtaxa: Dibasterium Houia Polystomurum Prosomapoda Thurandina
Ecology: