Elrathina_antiqua
Pachyaspis_deborra
Syspacephalus_gregarius
Ptychoparella_sp_A
Onchocephalus_thia
Maxicella_antelopea
Eokochaspis_longspina
Eokochaspis_cabinensis
Pachyaspis_gallagari
Onchocephalus_maior
Nyella_columbiana
Schistometopus_minor
Eokochaspis_piochensis
Tonopahella_goldfieldensis
Tonopahella_walcotti
Amecephalus_arrojosensis
Amecephalus_piochensis
Amecephalus_agnesensis
Amecephalus_cleora
Kochina_americana
Kochina_macrops
Inglefieldia_porosa
Kochiella_gracilis
Kochiella_mackenziensis
Kochiella_tuberculata
Kochiella_maxeyi
Kochiella_arenosa
Kochiella_chares
Kochiella_mansfieldi
Kochiella_rasettii
Kochiella_augusta
Kochiella_brevaspis
Kochiella_crito
Kochiella_eiffelensis
Kochiellina_groomensis
Kochiellina_janglensis
Kochaspis_liliana
Caborcella_arrojosensis
Caborcella_pseudaulax
Caborcella_reducta
Eokochaspis_nodosa
Caborcella_collaris
Nyella_skapta
Nyella_clinolimbata
Nyella_immoderata
Parapoulsenia_lata
Nyella_granosa
Nyella_rara
Nyella_plana
Kochiella_gibbosa
Hadrocephalites_cecinna
Hadrocephalites_lyndonensis
Hadrocephalites_convexus
Hadrocephalites_rhytidodes
Eokochaspis_delamarensis
Amecephalites_sundbergi
Eokochaspis_metalaspis
Mexicella_obscurus
Mexicella_robusta
Mexicella_stator
Mexicella_mexicana
Mexicella_grandoculus
Mexicella_granulata
Amecephalus_sp_A
Onchocephalus_depressus
Onchocephalus_fieldensis