Arachnomorpha Lameere, 1890 [= Arachnata Paulus, 1979, = Palaeopoda Packard, 1903] • †
Nettapezoura • †
Dicranocaris • †
Trilobita Walch, 1771 • †
Megacheira Hou & Bergstrom, 1997 • †
Strabopida Hou & Bergström, 1997 • †
Aglaspida Walcott, 1911 • †
Cheloniellida Broili, 1932 •
Chelicerata Heymons 1901 • Family †
Sanctacarididae Legg & Pates, 2017 • Class
Pycnogonida Latreille, 1810 • Clade
Euchelicerata Weygoldt & Paulus, 1979 • Family †
Offacolidae Sutton
et al., 2002 • Clade
Prosomapoda Lamsdell, 2013
Phylogeny Using fossil data, Bergström & Hou (2003) gave an outline of arthropod relationships emphasizing trilobitomorphs (a group that includes trilobites and trilobite-like animals). }} }} }} }} }} }} }} }} }} }} }} }} }} }} }} }} ==References==