Arthropoda Siebold, 1848 - arthropods
   Euarthropoda
     †megacheirans Hou & Bergström, 1997 [paraphyletic] see Class Megacheira Hou & Bergström, 1997
       1 Genus †Yohoia Walcott, 1912
       2.1 Genus †Alalcomenaeus Simonetta, 1970
       2.2 Genus †Leanchoilia Walcott, 1912