Opinions from F. Ameghino 1897
- 'Acoelodus belongs to Mesorhinidae'
- 'Acoelodus oppositus belongs to Acoelodus'
- 'Adianthidae [misspelled as Adiantidae] belongs to Litopterna'
- 'Anastylops belongs to Notostylopidae'
- 'Anastylops vallatus belongs to Anastylops'
- 'Ancylocoelus belongs to Leontiniidae'
- 'Ancylocoelus frequens belongs to Ancylocoelus'
- 'Archaeohyracidae belongs to Hyracoidea'
- 'Archaeohyrax belongs to Archaeohyracidae'
- 'Archaeohyrax patagonicus belongs to Archaeohyrax'
- 'Archaeohyrax proavus belongs to Archaeohyrax'
- 'Archaeohyrax propheticus belongs to Archaeohyrax'
- 'Archaeolophus belongs to Pyrotheridae'
- 'Archaeolophus praecursor belongs to Archaeolophus'
- 'Archaeophylus belongs to Protypotheridae'
- 'Archaeophylus patrius belongs to Archaeophylus'
- 'Archaeopithecidae belongs to Prosimiae'
- 'Archaeopithecus belongs to Archaeopithecidae'
- 'Archaeopithecus rogeri belongs to Archaeopithecus'
- 'Argyrohyrax belongs to Archaeohyracidae'
- 'Argyrohyrax proavus belongs to Argyrohyrax'
- 'Argyrosaurus superbus belongs to Argyrosaurus'
- 'Asmodeus belongs to Homalodontotheridae'
- 'Asmodeus osborni belongs to Asmodeus'
- 'Asmodeus scotti belongs to Asmodeus'
- 'Asteromys belongs to Cephalomyidae'
- 'Asteromys prospicuus belongs to Asteromys'
- 'Asteromys punctus belongs to Asteromys'
- 'Astrapotheriidae belongs to Astrapotheroidea'
- 'Astrapotherium ephebicum is recombined as Parastrapotherium ephebicum'
- 'Borhyaena antiqua is recombined as Proborhyaena antiqua'
- 'Caliphrium belongs to Proterotheriidae'
- 'Caliphrium simplex belongs to Caliphrium'
- 'Carnivora was reranked as a suborder and belongs to Sarcobora'
- 'Cephalomyidae belongs to Hystricomorpha'
- 'Cephalomys belongs to Cephalomyidae'
- 'Cephalomys arcidens belongs to Cephalomys'
- 'Cephalomys plexus belongs to Cephalomys'
- 'Clorinda is replaced by Plagiarthrus'
- 'Clorinda cliva is recombined as Plagiarthrus clivus'
- 'Coniopternium belongs to Mesorhinidae'
- 'Coniopternium andinum belongs to Coniopternium'
- 'Coresodon belongs to Notohippidae'
- 'Coresodon scalpridens belongs to Coresodon'
- 'Creodonta belongs to Sarcobora'
- 'Dasipidae [misspelled as Dasypidae] belongs to Dasypoda'
- 'Dasypoda belongs to Edentata'
- 'Dasyura was reranked as a suborder and belongs to Sarcobora'
- 'Deuterotherium belongs to Proterotheriidae'
- 'Deuterotherium distichum belongs to Deuterotherium'
- 'Didolodus belongs to Phenacodontidae'
- 'Didolodus multicuspis belongs to Didolodus'
- 'Diprotodonta was reranked as a superorder and belongs to Marsupialia'
- 'Epanorthidae belongs to Paucituberculata'
- 'Epanorthus belongs to Epanorthidae'
- 'Epanorthus chubutensis belongs to Epanorthus'
- 'Eudolops belongs to Polydolopidae'
- 'Eudolops tetragonus belongs to Eudolops'
- 'Eupithecops belongs to Notopithecidae'
- 'Eupithecops proximus belongs to Eupithecops'
- 'Eurygeniops belongs to Notohippidae'
- 'Eurygeniops normalis belongs to Eurygeniops'
- 'Eurygenium is replaced by Eurygeniops'
- 'Eurygenium latirostris is recombined as Eurygeniops latirostris'
- 'Eutrachytheridae belongs to Tipotheria'
- 'Eutrachytheriidae belongs to Typotheria'
- 'Eutrachytherus belongs to Eutrachytheriidae'
- 'Glyptatelus belongs to Propalaehoplophoridae'
- 'Glyptatelus tatusinus belongs to Glyptatelus'
- 'Glyptodontia was reranked as a suborder and belongs to Edentata'
- 'Gravigrada belongs to Edentata'
- 'Hapalops belongs to Megalonychidae'
- 'Hapalops antistis belongs to Hapalops'
- 'Hegetotheriidae [misspelled as Hegetotheridae] belongs to Tipotheria'
- 'Homalodontotheridae belongs to Ancylopoda'
- 'Hypsiprymnoidea was reranked as a order and belongs to Marsupialia'
- 'Hystricomorpha belongs to Rodentia'
- 'Insectivora was reranked as a suborder and belongs to Sarcobora'
- 'Isotemnidae belongs to Ancylopoda'
- 'Isotemnus belongs to Isotemnidae'
- 'Isotemnus conspiquus belongs to Isotemnus'
- 'Isotemnus primitivus belongs to Isotemnus'
- 'Lambdaconus belongs to Phenacodontidae'
- 'Lambdaconus suinus belongs to Lambdaconus'
- 'Leontinia belongs to Leontinidae'
- 'Leontinia fissicolis belongs to Leontinia'
- 'Leontinia garzoni belongs to Leontinia'
- 'Leontinia gaudryi belongs to Leontinia'
- 'Leontinia lapidosa is recombined as Senodon lapidosa'
- 'Leontinia oxyrhyncha belongs to Leontinia'
- 'Leontinia stenognatha belongs to Leontinia'
- 'Leontiniidae belongs to Ancylopoda'
- 'Liarthrus belongs to Astrapotheriidae'
- 'Liarthrus copei belongs to Liarthrus'
- 'Loxocoelus belongs to Leontiniidae'
- 'Loxocoelus carinatus belongs to Loxocoelus'
- 'Megalonychidae belongs to Gravigrada'
- 'Mesorhinidae belongs to Litopterna'
- 'Microbiotheridae is corrected as Microbiotheriidae and belongs to Pedimana'
- 'Morphippus belongs to Notohippidae'
- 'Morphippus complicatus belongs to Morphippus'
- 'Morphippus hypselodus belongs to Morphippus'
- 'Morphippus imbricatus belongs to Morphippus'
- 'Multituberculata was reranked as a suborder and belongs to Plagiaulacoidea'
- 'Nesodontidae belongs to Toxodontia'
- 'Notohippidae belongs to Litopterna'
- 'Notopithecidae belongs to Prosimiae'
- 'Notopithecus belongs to Notopithecidae'
- 'Notopithecus adapinus belongs to Notopithecus'
- 'Notopithecus fossulatus belongs to Notopithecus'
- 'Notopithecus summus belongs to Notopithecus'
- 'Notostylopidae belongs to Tillodontia'
- 'Notostylops belongs to Notostylopidae'
- 'Notostylops bicinctus belongs to Notostylops'
- 'Notostylops murinus belongs to Notostylops'
- 'Notostylops parvus belongs to Notostylops'
- 'Octodontotherium belongs to Orophodontidae'
- 'Octodontotherium crassidens belongs to Octodontotherium'
- 'Octodontotherium grandae belongs to Octodontotherium'
- 'Orchiomys belongs to Cephalomyidae'
- 'Orchiomys prostans belongs to Orchiomys'
- 'Orophodon belongs to Orophodontidae'
- 'Orophodon hapaloides belongs to Orophodon'
- 'Orophodontidae belongs to Gravigrada'
- 'Pachypithecus belongs to Archaeopithecidae'
- 'Pachypithecus macrognathus belongs to Pachypithecus'
- 'Palaeopeltidae belongs to Glyptodontia'
- 'Palaeopeltis belongs to Palaeopeltidae'
- 'Palaeopeltis inornatus belongs to Palaeopeltis'
- 'Parastrapotherium belongs to Astrapotheridae'
- 'Parastrapotherium cingulatum belongs to Parastrapotherium'
- 'Parastrapotherium holmbergi belongs to Parastrapotherium'
- 'Parastrapotherium lemoinei belongs to Parastrapotherium'
- 'Parastrapotherium trouessarti belongs to Parastrapotherium'
- 'Parastylops belongs to Notostylopidae'
- 'Parastylops coelodus belongs to Parastylops'
- 'Paucituberculata was reranked as a suborder and belongs to Plagiaulacoidea'
- 'Pedimanes was reranked as the suborder Pedimana and belongs to Sarcobora'
- 'Peltateloidea was reranked as a superfamily and belongs to Dasypoda'
- 'Peltephilidae belongs to Peltateloidea'
- 'Peltephilus belongs to Peltephilidae'
- 'Peltephilus depressus belongs to Peltephilus'
- 'Peltephilus protervus belongs to Peltephilus'
- 'Peltephilus undulatus belongs to Peltephilus'
- 'Periptychidae belongs to Condylarthra'
- 'Periptychus argentinus is recombined as Properiptychus argentinus'
- 'Pharsophorus belongs to Proborhyaenidae'
- 'Pharsophorus lacerans belongs to Pharsophorus'
- 'Pharsophorus mitis belongs to Pharsophorus'
- 'Pharsophorus tenax belongs to Pharsophorus'
- 'Pharsophorus tenuis belongs to Pharsophorus'
- 'Phenacodontidae belongs to Condylarthra'
- 'Pinnipedia was reranked as a suborder and belongs to Sarcobora'
- 'Plagiarthrus belongs to Archaeohyracidae'
- 'Plagiaulacoidea was reranked as a order and belongs to Diprotodonta'
- 'Pleurocoelodon belongs to Isotemnidae'
- 'Pleurocoelodon cingulatus belongs to Pleurocoelodon'
- 'Pleurocoelodon wingei belongs to Pleurocoelodon'
- 'Pleurostylodon belongs to Isotemnidae'
- 'Pleurostylodon minimus belongs to Pleurostylodon'
- 'Pleurostylodon modicus belongs to Pleurostylodon'
- 'Polydolopidae belongs to Multituberculata'
- 'Polydolops belongs to Polydolopidae'
- 'Polydolops tetragonus belongs to Polydolops'
- 'Polydolops thomasi belongs to Polydolops'
- 'Proadiantus belongs to Adiantidae'
- 'Proadiantus excavatus belongs to Proadiantus'
- 'Proadinotherium belongs to Nesodontidae'
- 'Proadinotherium angustidens belongs to Proadinotherium'
- 'Proadinotherium leptognathum belongs to Proadinotherium'
- 'Proborhyaena belongs to Proborhyaenidae'
- 'Proborhyaena gigantea belongs to Proborhyaena'
- 'Proborhyaenidae belongs to Sparassodonta'
- 'Prodasypus belongs to Dasypidae'
- 'Prodasypus ornatus belongs to Prodasypus'
- 'Proedium [misspelled as Proedrium] belongs to Eutrachytheriidae'
- 'Proedium solitarium [misspelled as Proedrium solitarium] belongs to Proedrium'
- 'Proeuphractus belongs to Dasypidae'
- 'Proeuphractus laevis belongs to Proeuphractus'
- 'Proeuphractus setiger belongs to Proeuphractus'
- 'Proeutatus belongs to Dasypidae'
- 'Proeutatus lagenaformis belongs to Proeutatus'
- 'Prohegetotherium belongs to Hegetotheridae'
- 'Prohegetotherium sculptum belongs to Prohegetotherium'
- 'Pronesodon belongs to Nesodontidae'
- 'Pronesodon cristatus belongs to Pronesodon'
- 'Pronesodon robustus belongs to Pronesodon'
- 'Propachyrucos belongs to Hegetotheridae'
- 'Propachyrucos crassus belongs to Propachyrucos'
- 'Propachyrucos smithwoodwardi belongs to Propachyrucos'
- 'Propalaehoplophoridae belongs to Glyptodontia'
- 'Properiptychus belongs to Periptychidae'
- 'Prosimiae belongs to Primates'
- 'Prosotherium belongs to Hegetotheridae'
- 'Prosotherium garzoni belongs to Prosotherium'
- 'Prosotherium robustum belongs to Prosotherium'
- 'Prosotherium triangulidens belongs to Prosotherium'
- 'Prostylops belongs to Isotemnidae'
- 'Prostylops typus belongs to Prostylops'
- 'Proterotheriidae belongs to Litopterna'
- 'Protheosodon belongs to Mesorhinidae'
- 'Protheosodon coniferus belongs to Protheosodon'
- 'Protypotheriidae is corrected as Protypotheridae and belongs to Tipotheria'
- 'Prozaedius belongs to Dasypidae'
- 'Prozaedius impressus belongs to Prozaedius'
- 'Prozaedius planus belongs to Prozaedius'
- 'Pyrotheridae belongs to Pyrotheria'
- 'Pyrotheriidae belongs to Pyrotheria'
- 'Pyrotherium belongs to Pyrotheridae'
- 'Pyrotherium giganteum belongs to Pyrotherium'
- 'Pyrotherium planum belongs to Pyrotherium'
- 'Pyrotherium romerii [misspelled as Pyrotherium romeri] belongs to Pyrotherium'
- 'Pyrotherium sorondoi belongs to Pyrotherium'
- 'Rhynchippus belongs to Notohippidae'
- 'Rhynchippus equinus belongs to Rhynchippus'
- 'Rhynchippus pumilus belongs to Rhynchippus'
- 'Rodiotherium belongs to Leontiniidae'
- 'Rodiotherium armatum belongs to Rodiotherium'
- 'Sarcobora belongs to Mammalia'
- 'Scaphops belongs to Leontiniidae'
- 'Scaphops grypus belongs to Scaphops'
- 'Senodon belongs to Nesodontidae'
- 'Senodon platyarthrus belongs to Senodon'
- 'Sparassodonta belongs to Sarcobora'
- 'Stenogenium belongs to Leontiniidae'
- 'Stenogenium sclerops belongs to Stenogenium'
- 'Tipotheria belongs to Ungulata'
- 'Titanosaurus australis belongs to Titanosaurus'
- 'Trachytherus is replaced by Eutrachytherus'
- 'Trachytherus conturbatus is recombined as Eutrachytherus conturbatus'
- 'Trachytherus spegazzinianus belongs to Trachytherus' according to Ameghino 1889
- 'Trachytherus spegazzinianus is recombined as Eutrachytherus spegazzinianus'
- 'Traspoatherium belongs to Astrapotheriidae'
- 'Traspoatherium convexidens belongs to Traspoatherium'
- 'Tricoelodus belongs to Mesorhinidae'
- 'Tricoelodus bicuspidatus belongs to Tricoelodus'
- 'Trigonostylops belongs to Notostylopidae'
- 'Trigonostylops wortmani belongs to Trigonostylops'
- 'Trimerostephanos belongs to Isotemnidae'
- 'Trimerostephanos angustus belongs to Trimerostephanos'
- 'Trimerostephanos biconus belongs to Trimerostephanos'
- 'Trimerostephanos scabrus belongs to Trimerostephanos'
- 'Trimerostephanos scalaris belongs to Trimerostephanos'