Opinions from G. G. Simpson 1948
- 'Acrostylops is a subjective synonym of Homalostylops'
- 'Acrostylops pungiunculus is a subjective synonym of Homalostylops parvus'
- 'Amilnedwardsia belongs to Macraucheniidae'
- 'Amilnedwardsia brevicula belongs to Amilnedwardsia'
- 'Amphidolops belongs to Polydolopidae'
- 'Amphidolops serrifer is a subjective synonym of Polydolops serra'
- 'Amphidolops serrula belongs to Amphidolops'
- 'Anadolops is a subjective synonym of Amphidolops'
- 'Anadolops thylacoleoides is a subjective synonym of Amphidolops serrula'
- 'Anastylops is a subjective synonym of Notostylops'
- 'Anastylops vallatus is a subjective synonym of Notostylops murinus'
- 'Anisolambda belongs to Proterotheriidae'
- 'Anisolambda amel belongs to Anisolambda'
- 'Anisolambda fissidens belongs to Anisolambda'
- 'Anisolambda longidens is recombined as Victorlemoinea longidens'
- 'Anissodolops is a subjective synonym of Polydolops'
- 'Anteutatus is a subjective synonym of Utaetus'
- 'Anteutatus laevus is recombined as Utaetus laevus'
- 'Anteutatus lenis is recombined as Utaetus lenis'
- 'Anutaetus is a subjective synonym of Pseudeutatus'
- 'Anutaetus circundatus is recombined as Pseudeutatus circundatus'
- 'Archaeodolops is a subjective synonym of Polydolops'
- 'Archaeohyracotherium belongs to Didolodontidae'
- 'Archaeorycteropus gallicus belongs to Archaeorycteropus' according to Ameghino 1905
- 'Archaeorycteropus patagonicus belongs to Archaeorycteropus' according to Ameghino 1905
- 'Archaeorycteropus patagonicus is a nomen vanum'
- 'Argyrolambda belongs to Didolodontidae'
- 'Argyrolambda conidens belongs to Argyrolambda'
- 'Argyrolestes belongs to Borhyaenidae'
- 'Argyrolestes peralestinus belongs to Argyrolestes'
- 'Arminiheringia belongs to Borhyaenidae'
- 'Arminiheringia auceta belongs to Arminiheringia'
- 'Arminiheringia contigua is a subjective synonym of Arminiheringia cultrata'
- 'Arminiheringia cultrata belongs to Arminiheringia'
- 'Asmithwoodwardia belongs to Didolodontidae'
- 'Asmithwoodwardia subtrigona belongs to Asmithwoodwardia'
- 'Astegotherium belongs to Dasypodidae'
- 'Astegotherium dichotomus is corrected as Astegotherium dichotomum and belongs to Astegotherium'
- 'Borhyaenidae belongs to Marsupialia'
- 'Caenolestidae belongs to Marsupialia'
- 'Caroloameghinia belongs to Caroloameghiniidae'
- 'Caroloameghinia mater belongs to Caroloameghinia'
- 'Caroloameghinia tenue is corrected as Caroloameghinia tenuis and belongs to Caroloameghinia'
- 'Caroloameghinidae is corrected as Caroloameghiniidae and belongs to Marsupialia'
- 'Catastylops is a subjective synonym of Notostylops'
- 'Catastylops deflexus is a nomen vanum'
- 'Catastylops pendens is recombined as Notostylops pendens'
- 'Cephanodus is a subjective synonym of Didolodus'
- 'Coelostylodon caroloameghinoi is a nomen dubium'
- 'Coelutaetus belongs to Dasypodidae'
- 'Coelutaetus cribellatus belongs to Coelutaetus'
- 'Coona belongs to Didelphidae'
- 'Coona pattersoni belongs to Coona'
- 'Dasipidae is corrected as Dasypodidae and belongs to Xenarthra'
- 'Decaconus is a subjective synonym of Polyacrodon'
- 'Decaconus intricatus is a subjective synonym of Polyacrodon lanciformis'
- 'Didelphidae belongs to Marsupialia'
- 'Didolodontidae belongs to Condylarthra'
- 'Didolodus belongs to Didolodontidae'
- 'Didolodus colligatus is a subjective synonym of Didolodus multicuspis'
- 'Didolodus crassicuspis is a subjective synonym of Didolodus multicuspis'
- 'Didolodus dispar is a subjective synonym of Didolodus multicuspis'
- 'Didolodus minor belongs to Didolodus'
- 'Didolodus multicuspis belongs to Didolodus'
- 'Dilestes is a subjective synonym of Arminiheringia'
- 'Dilestes dilobus is a subjective synonym of Arminiheringia auceta'
- 'Dimerostephanos chicoensis is a subjective synonym of Notostylops murinus'
- 'Edvardotrouessartia belongs to Notostylopidae'
- 'Edvardotrouessartia sola belongs to Edvardotrouessartia'
- 'Enneoconus belongs to Didolodontidae'
- 'Enneoconus parvidens belongs to Enneoconus'
- 'Entelostylops is a subjective synonym of Notostylops'
- 'Entelostylops appresus is recombined as Notostylops appressus'
- 'Entelostylops cestillus is a nomen vanum'
- 'Entelostylops completus is a subjective synonym of Notostylops murinus'
- 'Entelostylops incolumis is a subjective synonym of Homalostylops parvus'
- 'Entelostylops tripartitus is a subjective synonym of Notostylops murinus'
- 'Eolicaphrium belongs to Litopterna'
- 'Eolicaphrium primarium belongs to Eolicaphrium'
- 'Eostylops is a subjective synonym of Notostylops'
- 'Eostylops diversidens is a nomen vanum'
- 'Ernestohaeckelia belongs to Macraucheniidae'
- 'Ernestohaeckelia aculeata belongs to Ernestohaeckelia'
- 'Ernestohaeckelia acutidens belongs to Ernestohaeckelia'
- 'Ernestokokenia belongs to Didolodontidae'
- 'Ernestokokenia marginata is a subjective synonym of Ernestokokenia nitida'
- 'Ernestokokenia nitida belongs to Ernestokokenia'
- 'Eudolops belongs to Polydolopidae'
- 'Eudolops tetragonus belongs to Eudolops'
- 'Eulambda is a subjective synonym of Josepholeidya'
- 'Euprotogonia patagonica is recombined as Ernestokokenia patagonica'
- 'Euprotogonia trigonalis is recombined as Ernestokokenia trigonalis'
- 'Gashternia belongs to Marsupialia'
- 'Gashternia ctalehor belongs to Gashternia'
- 'Glyphodon is replaced by Xesmodon' according to Berg 1899
- 'Glyphodon langi is recombined as Xesmodon langi'
- 'Glyptatelus belongs to Glyptodontidae'
- 'Glyptatelus fractus belongs to Glyptatelus'
- 'Glyptatelus tatusinus belongs to Glyptatelus'
- 'Glyptodontidae belongs to Xenarthra'
- 'Guilielmofloweria belongs to Proterotheriidae'
- 'Guilielmofloweria plicata belongs to Guilielmofloweria'
- 'Hemistylops is a subjective synonym of Henricosbornia'
- 'Hemistylops paucicuspidatus is a subjective synonym of Henricosbornia lophodonta'
- 'Hemistylops trigonostyloides is a subjective synonym of Henricosbornia lophodonta'
- 'Henricosbornia belongs to Henricosborniidae'
- 'Henricosbornia alouatina is a subjective synonym of Henricosbornia lophodonta'
- 'Henricosbornia lophodonta belongs to Henricosbornia'
- 'Henricosbornia subconica is a subjective synonym of Henricosbornia lophodonta'
- 'Henricosbornidae is corrected as Henricosborniidae and belongs to Notioprogonia'
- 'Heteroglyphis belongs to Proterotheriidae'
- 'Heteroglyphis dewoletzky belongs to Heteroglyphis'
- 'Heterolambda is a subjective synonym of Ricardolydekkeria'
- 'Heterolambda lunulata is recombined as Ricardolydekkeria lunulata'
- 'Homalostylops belongs to Notostylopidae'
- 'Homalostylops interlissus is a nomen vanum'
- 'Homalostylops rigeo is a subjective synonym of Homalostylops parvus'
- 'Ideodelphys is a nomen vanum'
- 'Ideodelphys microscopicus is a nomen vanum'
- 'Isostylops is a subjective synonym of Notostylops'
- 'Isostylops fretus is a subjective synonym of Notostylops murinus'
- 'Isutaetus is a subjective synonym of Pseudeutatus'
- 'Isutaetus depictus is recombined as Pseudeutatus depictus'
- 'Josepholeidya belongs to Proterotheriidae'
- 'Josepholeidya adunca belongs to Josepholeidya'
- 'Josepholeidya deculca belongs to Josepholeidya'
- 'Lambdaconus alius is recombined as Polymorphis alius'
- 'Lambdaconus elegans belongs to Lambdaconus' according to Roth 1903
- 'Lambdaconus elegans is a nomen dubium'
- 'Lambdaconus mamma is recombined as Paulogervaisia mamma'
- 'Lambdaconus porcus is recombined as Paulogervaisia porca'
- 'Lomaphorelus belongs to Glyptodontidae'
- 'Lomaphorelus depstus belongs to Lomaphorelus'
- 'Lonchoconus is a subjective synonym of Didolodus'
- 'Lonchoconus lanceolatus is a subjective synonym of Didolodus multicuspis'
- 'Lopholambda is a subjective synonym of Ricardolydekkeria'
- 'Machlydotherium belongs to Dasypodidae'
- 'Machlydotherium asperum belongs to Machlydotherium'
- 'Machlydotherium ater belongs to Machlydotherium'
- 'Machlydotherium intortum belongs to Machlydotherium'
- 'Machlydotherium sparsus is corrected as Machlydotherium sparsum and belongs to Machlydotherium'
- 'Macraucheniidae belongs to Litopterna'
- 'Megacrodon is a subjective synonym of Polymorphis'
- 'Megacrodon planus is recombined as Polymorphis planus'
- 'Megacrodon prolixus is recombined as Xesmodon prolixus'
- 'Megalonychoidea belongs to Xenarthra'
- 'Meteutatus belongs to Dasypodidae'
- 'Meteutatus attonsus belongs to Meteutatus'
- 'Meteutatus percarinatus belongs to Meteutatus'
- 'Meteutatus rigidus belongs to Meteutatus'
- 'Microstylops is a subjective synonym of Henricosbornia'
- 'Microstylops clarus is a subjective synonym of Henricosbornia lophodonta'
- 'Microstylops monoconus is a subjective synonym of Henricosbornia lophodonta'
- 'Monolophodon is a subjective synonym of Henricosbornia'
- 'Monolophodon minutus is recombined as Henricosbornia minuta'
- 'Nemolestes belongs to Borhyaenidae'
- 'Nemolestes spalacotherinus belongs to Nemolestes'
- 'Nephacodus is a subjective synonym of Didolodus'
- 'Nephacodus latigonus is recombined as Didolodus latigonus'
- 'Notioprogonia belongs to Notoungulata'
- 'Notoprotogonia is a subjective synonym of Ernestokokenia'
- 'Notostylopidae belongs to Notioprogonia'
- 'Notostylops belongs to Notostylopidae'
- 'Notostylops ampullaceus is a subjective synonym of Notostylops murinus'
- 'Notostylops aspectans is a subjective synonym of Notostylops murinus'
- 'Notostylops bicinctus is a nomen vanum'
- 'Notostylops brachycephalus is a subjective synonym of Notostylops murinus'
- 'Notostylops chicoensis is a subjective synonym of Notostylops murinus'
- 'Notostylops complexus is a subjective synonym of Notostylops murinus'
- 'Notostylops escaridus is a subjective synonym of Notostylops murinus'
- 'Notostylops irregularis is a subjective synonym of Notostylops murinus'
- 'Notostylops murinus belongs to Notostylops'
- 'Notostylops parvus is recombined as Homalostylops parvus'
- 'Notostylops pigafettai belongs to Notostylops'
- 'Notostylops promurinus is a subjective synonym of Notostylops murinus'
- 'Odontomysops belongs to Marsupialia'
- 'Odontomysops spiniferus belongs to Odontomysops'
- 'Oroacrodon is an objective synonym of Polyacrodon'
- 'Orthodolops is a subjective synonym of Polydolops'
- 'Orthodolops sciurinus is a subjective synonym of Polydolops thomasi crassus'
- 'Orthutaetus is a subjective synonym of Utaetus'
- 'Orthutaetus clavatus is a subjective synonym of Utaetus buccatus'
- 'Orthutaetus crenulatus is a subjective synonym of Utaetus buccatus'
- 'Othnielmarshia belongs to Henricosborniidae'
- 'Othnielmarshia lacunifera belongs to Othnielmarshia'
- 'Otrhonia is corrected as Otronia and belongs to Notostylopidae'
- 'Otronia muehlbergi belongs to Otronia'
- 'Pachyzaedyus is a subjective synonym of Pseudeutatus'
- 'Pachyzaedius is a misspelling of Pachyzaedyus' according to Ameghino 1906
- 'Pachyzaedyus cuneiformis is recombined as Pseudeutatus cuneiformis'
- 'Palaeopeltis belongs to Glyptodontidae'
- 'Palaeopeltis inornatus belongs to Palaeopeltis'
- 'Palaeopeltis tesseratus belongs to Palaeopeltis'
- 'Pantostylopidae is a subjective synonym of Henricosborniidae'
- 'Pantostylops is a subjective synonym of Henricosbornia'
- 'Pantostylops completus is a subjective synonym of Henricosbornia lophodonta'
- 'Pantostylops incompletus is a subjective synonym of Henricosbornia lophodonta'
- 'Pantostylops minutus is recombined as Peripantostylops minutus'
- 'Pantostylops typus is a subjective synonym of Henricosbornia lophodonta'
- 'Parutaetus is a subjective synonym of Utaetus'
- 'Parutaetus chicoensis is a subjective synonym of Utaetus buccatus'
- 'Parutaetus clusus is a subjective synonym of Utaetus buccatus'
- 'Parutaetus signatus is a subjective synonym of Utaetus buccatus'
- 'Patene belongs to Borhyaenidae'
- 'Patene coluapiensis belongs to Patene'
- 'Paulogervaisia belongs to Didolodontidae'
- 'Paulogervaisia celata is a nomen dubium'
- 'Paulogervaisia inusta belongs to Paulogervaisia'
- 'Periacrodon is a subjective synonym of Polyacrodon'
- 'Peripantostylops belongs to Henricosborniidae'
- 'Pharsophorus belongs to Borhyaenidae'
- 'Pharsophorus lacerans belongs to Pharsophorus'
- 'Plesiofelis is a subjective synonym of Pharsophorus'
- 'Plesiofelis cretaceus is recombined as Pharsophorus cretaceus'
- 'Plesiofelis schlosseri is a subjective synonym of Pharsophorus lacerans'
- 'Pliodolops is a subjective synonym of Polydolops'
- 'Pliodolops primulus is recombined as Polydolops primulus'
- 'Pliostylops is a subjective synonym of Notostylops'
- 'Pliostylops magnificus is a subjective synonym of Notostylops murinus'
- 'Polyacrodon belongs to Proterotheriidae'
- 'Polyacrodon lanciformis belongs to Polyacrodon'
- 'Polyacrodon ligatus belongs to Polyacrodon'
- 'Polydolopidae belongs to Marsupialia'
- 'Polydolops belongs to Polydolopidae'
- 'Polydolops bocurhor belongs to Polydolops'
- 'Polydolops clavulus belongs to Polydolops'
- 'Polydolops crassus is recombined as Polydolops thomasi crassus'
- 'Polydolops fur is a subjective synonym of Polydolops thomasi thomasi'
- 'Polydolops kamektsen belongs to Polydolops'
- 'Polydolops rothi belongs to Polydolops'
- 'Polydolops serra belongs to Polydolops'
- 'Polydolops simplex is a subjective synonym of Polydolops thomasi thomasi'
- 'Polydolops thomasi belongs to Polydolops'
- 'Polydolops thomasi mara belongs to Polydolops thomasi'
- 'Polydolops thomasi paahi belongs to Polydolops thomasi'
- 'Polydolops thomasi thomasi belongs to Polydolops thomasi'
- 'Polydolops winecage belongs to Polydolops'
- 'Polymorphis belongs to Proterotheriidae'
- 'Polymorphis lechei belongs to Polymorphis'
- 'Polystylops is a subjective synonym of Henricosbornia'
- 'Polystylops amplus is recombined as Henricosbornia ampla'
- 'Polystylops progrediens is a subjective synonym of Henricosbornia lophodonta'
- 'Posteutatus is a subjective synonym of Utaetus'
- 'Posteutatus indemnis is a subjective synonym of Utaetus buccatus'
- 'Posteutatus indentatus is a subjective synonym of Utaetus buccatus'
- 'Posteutatus scabridus is a subjective synonym of Utaetus buccatus'
- 'Postpithecus is a subjective synonym of Othnielmarshia'
- 'Postpithecus curvicrista is recombined as Othnielmarshia curvicrista'
- 'Postpithecus reflexus is recombined as Othnielmarshia reflexa'
- 'Proacrodon is a nomen vanum'
- 'Proacrodon transformatus is a nomen vanum'
- 'Procladosictis belongs to Borhyaenidae'
- 'Procladosictis anomala belongs to Procladosictis'
- 'Procladosictis erecta is a nomen vanum'
- 'Proectocion belongs to Didolodontidae'
- 'Proectocion argentinus belongs to Proectocion'
- 'Proectocion precisus belongs to Proectocion'
- 'Proeutatus lagenaformis is recombined as Meteutatus lagenaformis'
- 'Progarzonia belongs to Caenolestidae'
- 'Progarzonia notostylopense belongs to Progarzonia'
- 'Prohyracotherium is a subjective synonym of Henricosbornia'
- 'Prohyracotherium matutinum is a subjective synonym of Henricosbornia lophodonta'
- 'Prohyracotherium medialis is recombined as Archaeohyracotherium mediale'
- 'Prohyracotherium patagonicum is a subjective synonym of Henricosbornia lophodonta'
- 'Promysops is a subjective synonym of Eudolops'
- 'Promysops acuminatus is recombined as Eudolops acuminatus'
- 'Promysops primarius is a nomen vanum'
- 'Proplatyarthrus belongs to Megalonychoidea'
- 'Proplatyarthrus longipes belongs to Proplatyarthrus' according to Ameghino 1905
- 'Proplatyarthrus longipes belongs to Proplatyarthrus'
- 'Propolymastodon is a subjective synonym of Eudolops'
- 'Propolymastodon cardatus is a subjective synonym of Eudolops acuminatus'
- 'Propolymastodon caroliameghinoi is recombined as Eudolops caroliameghinoi'
- 'Prostegotherium belongs to Dasypodidae'
- 'Prostegotherium astrifer belongs to Prostegotherium'
- 'Prostegotherium notostylopianum belongs to Prostegotherium'
- 'Proterotheriidae belongs to Litopterna'
- 'Protobradys belongs to Megalonychoidea'
- 'Protobradys harmonicus belongs to Protobradys'
- 'Pseudeutatus belongs to Dasypodidae'
- 'Pseudeutatus clypeus belongs to Pseudeutatus'
- 'Pseudocladosictis is a nomen vanum'
- 'Pseudocladosictis determinabile is a nomen vanum'
- 'Pseudolops is a subjective synonym of Polydolops'
- 'Pseudolops princeps is recombined as Polydolops princeps'
- 'Pseudostegotherium belongs to Dasypodidae'
- 'Pseudostegotherium chubutanum belongs to Pseudostegotherium'
- 'Pseudostegotherium glangeaudi belongs to Pseudostegotherium'
- 'Ricardolydekkeria belongs to Proterotheriidae'
- 'Ricardolydekkeria cinctula belongs to Ricardolydekkeria'
- 'Ricardolydekkeria praerupta belongs to Ricardolydekkeria'
- 'Ricardolydekkeria profunda belongs to Ricardolydekkeria'
- 'Rutimeyeria belongs to Macraucheniidae'
- 'Rutimeyeria conulifera belongs to Rutimeyeria'
- 'Sadypus is a subjective synonym of Meteutatus'
- 'Sadypus ascendens is recombined as Meteutatus ascendens'
- 'Sadypus confluens is recombined as Meteutatus confluens'
- 'Selenoconidae is a subjective synonym of Henricosborniidae'
- 'Selenoconus is a subjective synonym of Henricosbornia'
- 'Selenoconus agilis is a subjective synonym of Peripantostylops minutus'
- 'Selenoconus centralis is a subjective synonym of Henricosbornia lophodonta'
- 'Selenoconus senex is a subjective synonym of Henricosbornia lophodonta'
- 'Selenoconus spiculatus is a subjective synonym of Henricosbornia lophodonta'
- 'Seumadia belongs to Polydolopidae'
- 'Seumadia yapa belongs to Seumadia'
- 'Utaetus belongs to Dasypodidae'
- 'Utaetus argos is a subjective synonym of Utaetus buccatus'
- 'Utaetus buccatus belongs to Utaetus'
- 'Utaetus deustus belongs to Utaetus'
- 'Utaetus laxus is a subjective synonym of Utaetus buccatus'
- 'Victorlemoineia [misspelled as Victorlemoinea] belongs to Macraucheniidae'
- 'Victorlemoineia emarginata [misspelled as Victorlemoinea emarginata] belongs to Victorlemoinea'
- 'Victorlemoineia labyrinthica [misspelled as Victorlemoinea labyrinthica] belongs to Victorlemoinea'
- 'Wainka belongs to Proterotheriidae'
- 'Wainka tshotshe belongs to Wainka'
- 'Xenarthra belongs to Edentata'
- 'Xesmodon belongs to Proterotheriidae'