(Ptychoparella_cordillerae,(Eoptychoparia_piochensis,((Pianaspis_sors,Papyriaspis_lanceola),(Proehmaniella_basilica,((Elrathiella_euthyopsis,(Alokistocare_paranotatum,(((Amecephalus_idahoense,(Amecephalus_cleora,(Amecephalus_piochensis,Amecephalus_laticaudum))),(Altiocculus_americanus,(Altiocculus_harrisi,(Altiocculus_drumensis,Altiocculus_concavus)))),(Alokistocare_swasii,Alokistocare_subcoronatum)))),(Ehmaniella_waptaensis,Ehmaniella_fronsplanata))))));