Opinions from C. B. Schultz and C. H. Falkenbach 1968
- 'Bathygenys alpha hedlundae belongs to Bathygenys alpha'
- 'Brachycrus laticeps mooki belongs to Brachycrus laticeps'
- 'Brachycrus rusticus riograndensis belongs to Brachycrus rusticus'
- 'Brachycrus vaughani rioosoensis belongs to Brachycrus vaughani'
- 'Brachymeryx is a subjective synonym of Cyclopidius'
- 'Brachymeryx feliceps is a subjective synonym of Cyclopidius simus'
- 'Cotylops speciosa is a subjective synonym of Merycoidodon culbertsonii'
- 'Cyclopidius belongs to Leptaucheniini'
- 'Chelonocephalus is a subjective synonym of Cyclopidius'
- 'Cyclopidius (Chelonocephalus) schucherti is a subjective synonym of Leptauchenia decora'
- 'Cyclopidius emydinus belongs to Cyclopidius'
- 'Cyclopidius heterodon is recombined as Sespia heterodon'
- 'Cyclopidius heterodon belongs to Cyclopidius' according to Schlaikjer 1935
- 'Cyclopidius incisivus is a subjective synonym of Cyclopidius simus'
- 'Cyclopidius loganensis is a subjective synonym of Pithecistes brevifacies'
- 'Cyclopidius lullianus is recombined as Pseudocyclopidius lullianus'
- 'Cyclopidius lullianus belongs to Cyclopidius' according to Thorpe 1921
- 'Cyclopidius quadratus is recombined as Pseudocyclopidius quadratus'
- 'Cyclopidius simus belongs to Cyclopidius'
- 'Dayohyus belongs to Eporeodontinae'
- 'Dayohyus wortmani belongs to Dayohyus'
- 'Desmatochoerus (Paradesmatochoerus) anthonyi belongs to Desmatochoerus (Paradesmatochoerus)'
- 'Desmatochoerus anthyonyi belongs to Desmatochoerus'
- 'Epigenetochoerus belongs to Merycoidodontinae'
- 'Eporeodon belongs to Eporeodontinae'
- 'Eporeodon (Paraeporeodon) belongs to Eporeodon'
- 'Eporeodon condoni is recombined as Pseudogenetochoerus condoni'
- 'Eporeodon davisi belongs to Eporeodon'
- 'Eporeodon major cedrensis is recombined as Otionohyus (Otarohyus) cedrensis'
- 'Eporeodon perbullatus is recombined as Eporeodon (Paraeporeodon) longifrons perbullatus'
- 'Eporeodon trigonocephalus parvus is recombined as Epigenetochoerus parvus'
- 'Eporeodontinae belongs to Merycoidodontidae'
- 'Eucrotaphus is a nomen vanum'
- 'Eucrotaphus dickinsonensis is recombined as Genetochoerus (Osbornohyus) dickinsonensis'
- 'Eucrotaphus helenae is recombined as Otionohyus (Otarohyus) hybridus helenae'
- 'Eucrotaphus jacksoni is a nomen vanum'
- 'Eporeodon (Paraeporeodon) pacficus is a subjective synonym of Otionohyus (Otarohyus) bullatus'
- 'Eucrotaphus jacksoni leptacanthus is recombined as Eporeodon (Paraeporeodon) leptacanthus'
- 'Eucrotaphus jacksoni pacificus is recombined as Eporeodon (Paraeporeodon) pacificus'
- 'Eucrotaphus major longifrons is recombined as Eporeodon (Paraeporeodon) longifrons'
- 'Eucrotaphus trigonocephalus is recombined as Dayohyus trigonocephalus'
- 'Genetochoerus belongs to Merycoidodontinae'
- 'Genetochoerus (Osbornohyus) belongs to Genetochoerus'
- 'Genetochoerus (Osbornohyus) chamberlaini belongs to Genetochoerus (Osbornohyus)'
- 'Genetochoerus (Osbornohyus) geygani belongs to Genetochoerus (Osbornohyus)'
- 'Genetochoerus (Osbornohyus) norbeckensis belongs to Genetochoerus (Osbornohyus)'
- 'Hadroleptauchenia belongs to Leptaucheniini'
- 'Hadroleptauchenia eiseleyi belongs to Hadroleptauchenia'
- 'Hadroleptauchenia extrema belongs to Hadroleptauchenia'
- 'Hadroleptauchenia primitiva belongs to Hadroleptauchenia'
- 'Hadroleptauchenia shanafeltae belongs to Hadroleptauchenia'
- 'Leptauchenia belongs to Leptaucheniini'
- 'Leptauchenia (Sespia) was reranked as Sespia and belongs to Sespiini'
- 'Leptauchenia (Sespia) californica is recombined as Sespia californica'
- 'Leptauchenia decora belongs to Leptauchenia'
- 'Leptauchenia densa is recombined as Hadroleptauchenia densa'
- 'Leptauchenia harveyi belongs to Leptauchenia'
- 'Leptauchenia major is recombined as Pseudocyclopidius major'
- 'Leptauchenia margeryae belongs to Leptauchenia'
- 'Leptauchenia martini belongs to Leptauchenia'
- 'Leptauchenia minora is a subjective synonym of Sespia nitida'
- 'Leptauchenia nitida belongs to Leptauchenia' according to Leidy 1869
- 'Leptauchenia nitida is recombined as Sespia nitida'
- 'Leptauchenia parasimus belongs to Leptauchenia'
- 'Leptaucheniinae belongs to Merycoidodontidae'
- 'Leptaucheniini belongs to Leptaucheniinae'
- 'Megabathygenys belongs to '
- 'Megabathygenys goorisi belongs to Megabathygenys'
- 'Megasespia belongs to Sespiini'
- 'Megasespia middleswarti belongs to Megasespia'
- 'Merychyus crabilli ziaensis belongs to Merychyus crabilli'
- 'Merycochoerinae belongs to Merycoidodontidae'
- 'Merycochoerus (Brachycrus) was reranked as Brachycrus and belongs to Merycochoerinae'
- 'Merycochoerus buwaldi is recombined as Brachycrus buwaldi'
- 'Merycoidodon belongs to Merycoidodontinae'
- 'Merycoidodon (Anomerycoidodon) belongs to Merycoidodon'
- 'Merycoidodon (Anomerycoidodon) dani belongs to Merycoidodon (Anomerycoidodon)'
- 'Merycoidodon (Anomerycoidodon) lambi belongs to Merycoidodon (Anomerycoidodon)'
- 'Merycoidodon (Blickohyus) belongs to Merycoidodon'
- 'Merycoidodon (Blickohyus) galushai belongs to Merycoidodon (Blickohyus)'
- 'Merycoidodon (Blickohyus) lynchi belongs to Merycoidodon (Blickohyus)'
- 'Merycoidodon culbertsonii belongs to Merycoidodon'
- 'Merycoidodon culbertsonii browni belongs to Merycoidodon culbertsonii'
- 'Merycoidodon culbertsonii osborni belongs to Merycoidodon culbertsonii'
- 'Merycoidodon forsythae belongs to Merycoidodon'
- 'Merycoidodontinae belongs to Merycoidodontidae'
- 'Oreodon bullatus is recombined as Otionohyus (Otarohyus) bullatus'
- 'Oreodon culbertsoni periculorum is recombined as Genetochoerus periculorum'
- 'Oreodon hybridus is recombined as Otionohyus (Otarohyus) hybridus'
- 'Oreodon macrorhinus is recombined as Merycoidodon macrorhinus'
- 'Oreodon major is recombined as Paramerycoidodon (Barbourochoerus) major'
- 'Oreodon occidentalis is recombined as Eporeodon occidentalis'
- 'Oreodon priscum is a subjective synonym of Merycoidodon culbertsonii'
- 'Oreodon robustum is a subjective synonym of Merycoidodon culbertsonii'
- 'Otionohyus belongs to Merycoidodontinae'
- 'Otionohyus (Otarohyus) belongs to Otionohyus'
- 'Otionohyus (Otarohyus) alexi belongs to Otionohyus (Otarohyus)'
- 'Otionohyus vanderpooli belongs to Otionohyus'
- 'Otionohyus wardi belongs to Otionohyus'
- 'Otionohyus wardi degrooti belongs to Otionohyus wardi'
- 'Parabathygenys belongs to '
- 'Parabathygenys paralpha belongs to Parabathygenys'
- 'Paramerycoidodon belongs to Merycoidodontinae'
- 'Paramerycoidodon (Barbourochoerus) belongs to Paramerycoidodon'
- 'Paramerycoidodon (Barbourochoerus) bacai belongs to Paramerycoidodon (Barbourochoerus)'
- 'Paramerycoidodon (Gregoryochoerus) belongs to Paramerycoidodon'
- 'Paramerycoidodon (Gregoryochoerus) meagherensis belongs to Paramerycoidodon (Gregoryochoerus)'
- 'Paramerycoidodon (Gregoryochoerus) meagherensis is recombined as Eporeodon meagherensis'
- 'Paramerycoidodon (Gregoryochoerus) wanlessi belongs to Paramerycoidodon (Gregoryochoerus)'
- 'Paramerycoidodon georgei belongs to Paramerycoidodon'
- 'Pithecistes belongs to Leptaucheniini'
- 'Pithecistes altageringensis belongs to Pithecistes'
- 'Pithecistes breviceps is a subjective synonym of Pithecistes brevifacies'
- 'Pithecistes brevifacies belongs to Pithecistes'
- 'Pithecistes copei belongs to Pithecistes'
- 'Pithecistes decedens is a subjective synonym of Cyclopidius simus'
- 'Pithecistes facies is a subjective synonym of Pithecistes brevifacies'
- 'Pithecistes mariae belongs to Pithecistes'
- 'Pithecistes tanneri belongs to Pithecistes'
- 'Pseudocyclopidius belongs to Leptaucheniini'
- 'Pseudocyclopidius frankforteri belongs to Pseudocyclopidius'
- 'Pseudocyclopidius lullianus expiratus belongs to Pseudocyclopidius lullianus'
- 'Pseudocyclopidius orellaensis belongs to Pseudocyclopidius'
- 'Pseudogenetochoerus belongs to Merycoidodontinae'
- 'Pseudogenetochoerus covensis belongs to Pseudogenetochoerus'
- 'Sespia marianae belongs to Sespia'
- 'Sespia ultima belongs to Sespia'
- 'Sespiini belongs to Leptaucheniinae'
- 'Ticholeptus hypsodus leadorensis belongs to Ticholeptus hypsodus'
- 'Ustatochoerus profectus nevadaensis belongs to Ustatochoerus profectus'