Opinions from B. D. E. Chatterton and R. Ludvigsen 2004
- 'Acernaspis copperi belongs to Acernaspis'
- 'Amphilichas anticostiensis is recombined as Arctinurus anticostiensis'
- 'Amphilichas aranaceus belongs to Amphilichas' according to Twenhofel 1929
- 'Amphilichas aranaceus is recombined as Arctinurus aranaceus'
- 'Amphilichas shallopensis is recombined as Arctinurus shallopensis'
- 'Anacaenaspis wrighti belongs to Anacaenaspis'
- 'Anacaenaspis zedei belongs to Anacaenaspis'
- 'Bessazoon gibbae belongs to Bessazoon'
- 'Bronteus insularis belongs to Bronteus' according to Billings 1866
- 'Bronteus insularis is recombined as Goldius insularis' according to Twenhofel 1928
- 'Bronteus insularis is recombined as Kosovopeltis insularis'
- 'Calymene barnesi belongs to Calymene'
- 'Calymene gamachei belongs to Calymene'
- 'Calymene nowlani belongs to Calymene'
- 'Calymene schucherti is recombined as Diacalymene schucherti'
- 'Dalaspis belongs to Odontopleurinae'
- 'Dalaspis boltoni belongs to Dalaspis'
- 'Dalaspis pustulosa belongs to Dalaspis'
- 'Dalmanites caudatus jupiterensis is recombined as Dalmanites jupiterensis'
- 'Daytonia jollieti belongs to Daytonia'
- 'Decoroproetus dewingi belongs to Decoroproetus'
- 'Decoroproetus narbonnei belongs to Decoroproetus'
- 'Dekalymene is a subjective synonym of Diacalymene'
- 'Diacalymene lesperancei belongs to Diacalymene'
- 'Dionide perplexa is recombined as Stelckaspis perplexa'
- 'Distyrax maccormicki belongs to Distyrax'
- 'Encrinurus deomenos belongs to Encrinurus' according to Tripp 1962
- 'Encrinurus jini belongs to Encrinurus'
- 'Encrinurus longi belongs to Encrinurus'
- 'Exallaspis bruntoni belongs to Exallaspis'
- 'Exallaspis maccrackeni belongs to Exallaspis'
- 'Failleana magnifica belongs to Failleana'
- 'Failleana wangi belongs to Failleana'
- 'Illaenus grandis belongs to Illaenus' according to Billings 1859
- 'Illaenus grandis is recombined as Stenopareia grandis'
- 'Kettneraspis copelandi belongs to Kettneraspis'
- 'Kettneraspis ramskoeldi belongs to Kettneraspis'
- 'Lichas canadensis belongs to Lichas' according to Billings 1866
- 'Lichas canadensis is replaced by Amphilichas anticostiensis' according to Northrup 1939
- 'Lichas canadensis is a subjective synonym of Arctinurus anticostiensis'
- 'Lichas menieri belongs to Lichas'
- 'Proetus achabae belongs to Proetus'
- 'Proetus arsenaulti belongs to Proetus'
- 'Proetus asaphoides belongs to Proetus' according to Curtis 1958
- 'Proetus kopaninensis belongs to Proetus' according to Snajdr 1980
- 'Proetus lindoei belongs to Proetus'
- 'Radiurus adraini belongs to Radiurus'
- 'Sphaerexochus canadensis belongs to Sphaerexochus' according to Billings 1866
- 'Sphaerexochus canadensis is recombined as Youngia canadensis' according to Norford 1994
- 'Sphaerexochus canadensis is recombined as Hyrokybe canadensis'
- 'Stenopareia duffyae belongs to Stenopareia'