Synonyms: Gnathopoda Straus-Durkheim 1829, Merostomata Dana 1852, Poecilopoda Claus 1868, Poecilopoda M'Coy 1849, Xyphosures Latrielle 1802
Full reference: P. A. Latreille. 1802. Histoire Naturelle, Générale et Particulière des Crustacés et des Insectes. 3:1-467
Parent taxon: Prosomapoda according to J. C. Lamsdell 2013
See also Bengtson 1992, Bergström 1968, Bicknell et al. 2021, Bicknell et al. 2022, Dunlop et al. 2020, Krzemiński et al. 2010, Lamsdell 2016, Lamsdell 2020, M'Coy 1849, Nielsen 2012, Sepkoski 2002 and Størmer 1955
Sister taxa: Anderella, Borchgrevinkium, Camanchia, Legrandella, Planaterga, Synziphosurina, Venustulus, Weinberginidae
Subtaxa: Borchgrevingkium Gdowia Kasibelinuridae Lunataspis Maldybulakia Micrichnus Patesia Sinaglaspis Willwerathia Xiphosurida