Opinions from L. M. Van Valen 1978
- 'Ancalagon belongs to Priapulida'
- 'Anisonchus agapetillus is recombined as Oxyacodon agapetillus'
- 'Anisonchus athelas belongs to Anisonchus'
- 'Anisonchus cophater is recombined as Oxyacodon cophater'
- 'Anisonchus eowynae belongs to Anisonchus'
- 'Arctocyonides mumak belongs to Arctocyonides'
- 'Bomburia belongs to Mioclaenidae'
- 'Carcinodon is a subjective synonym of Oxyclaenus'
- 'Carcinodon belongs to Arctocyonidae' according to Scott 1892
- 'Carcinodon aquilonius is a subjective synonym of Oxyprimus albertensis'
- 'Carsioptychus is a subjective synonym of Periptychus'
- 'Chriacus antiquus is recombined as Baioconodon antiquus'
- 'Chriacus calenancus belongs to Chriacus'
- 'Chriacus katrinae belongs to Chriacus'
- 'Chriacus metocometi belongs to Chriacus'
- 'Chriacus oconostotae belongs to Chriacus'
- 'Chriacus priscus is a subjective synonym of Loxolophus hyattianus'
- 'Chriacus priscus is recombined as Protochriacus priscus' according to Osborn and Earle 1895
- 'Chriacus pugnax is recombined as Thangorodrim pugnax'
- 'Chriacus pugnax belongs to Chriacus' according to Simpson 1935
- 'Chriacus pusillus is a subjective synonym of Chriacus orthogonius'
- 'Chriacus ruetimeyerianus is a subjective synonym of Loxolophus pentacus'
- 'Chriacus schlosserianus is a subjective synonym of Chriacus baldwini'
- 'Chriacus simplex is recombined as Oxyclaenus simplex'
- 'Chriacus truncatus is a subjective synonym of Chriacus baldwini'
- 'Claenodon is a subjective synonym of Arctocyonides'
- 'Claenodon acrogenius is recombined as Mentoclaenodon acrogenius'
- 'Claenodon vecordensis is a subjective synonym of Colpoclaenus silberlingi'
- 'Conoryctes crassicuspis is recombined as Goniacodon crassicuspis'
- 'Deltatherium baldwini is recombined as Chriacus baldwini'
- 'Deltatherium durini belongs to Deltatherium'
- 'Desmatoclaenus dianae belongs to Desmatoclaenus'
- 'Desmatoclaenus mearae belongs to Desmatoclaenus'
- 'Deuterogonodon noletil belongs to Deuterogonodon'
- 'Dissacus saurognathus is recombined as Ancalagon saurognathus'
- 'Dissacus saurognathus belongs to Dissacus' according to Wortman 1897
- 'Dracoclaenus is a subjective synonym of Protoselene'
- 'Earendil belongs to '
- 'Earendil undomiel belongs to Earendil'
- 'Ectoconus majusculus is a subjective synonym of Ectoconus ditrigonus'
- 'Ellipsodon aequidens is recombined as Litomylus aequidens'
- 'Ellipsodon aquilonius is a subjective synonym of Promioclaenus acolytus'
- 'Ellipsodon priscus is recombined as Bomburia priscus'
- 'Ellipsodon priscus belongs to Ellipsodon' according to Cifelli 1983
- 'Ellipsodon shepherdi is a subjective synonym of Litaletes sternbergi'
- 'Ellipsodon sternbergi is recombined as Litaletes sternbergi'
- 'Ellipsodon witkoi belongs to Ellipsodon'
- 'Ellipsodon yotankae belongs to Ellipsodon'
- 'Eoconodon copanus belongs to Eoconodon'
- 'Eoconodon nidhoggi belongs to Eoconodon'
- 'Epichriacus is a subjective synonym of Chriacus'
- 'Escatepos is a subjective synonym of Oxyacodon'
- 'Escatepos campi is a subjective synonym of Oxyacodon agapetillus'
- 'Fimbrethil belongs to '
- 'Fimbrethil ambaronae belongs to Fimbrethil'
- 'Goniacodon hiawathae belongs to Goniacodon'
- 'Haplaletes andakupensis belongs to Haplaletes'
- 'Haploconus gillianus is recombined as Anisonchus gillianus'
- 'Hyopsodus acolytus is recombined as Promioclaenus acolytus'
- 'Jepsenia is a subjective synonym of Litaletes'
- 'Jepsenia mantiensis is a subjective synonym of Litaletes sternbergi'
- 'Leptacodon proserpinae belongs to Leptacodon'
- 'Litaletes ondolinde belongs to Litaletes'
- 'Litomylus alphamon belongs to Litomylus'
- 'Litomylus osceolae belongs to Litomylus'
- 'Litomylus scaphicus is a subjective synonym of Litomylus dissentaneus'
- 'Litomylus scaphiscus is a subjective synonym of Litomylus dissentaneus'
- 'Loxolophus nordicus is recombined as Ragnarok nordicum'
- 'Maiorana belongs to Periptychidae'
- 'Maiorana noctiluca belongs to Maiorana'
- 'Meniscotherium priscum is a subjective synonym of Ectocion parvus'
- 'Metachriacus is a subjective synonym of Chriacus'
- 'Metachriacus belongs to ' according to Fox 1990
- 'Metachriacus provocator is a subjective synonym of Chriacus baldwini'
- 'Metachriacus punitor is a subjective synonym of Chriacus orthogonius'
- 'Mimatuta belongs to Periptychidae'
- 'Mimatuta makpialutae belongs to Mimatuta'
- 'Mimatuta minuial belongs to Mimatuta'
- 'Mimatuta morgoth belongs to Mimatuta'
- 'Mimotricentes angustidens is a subjective synonym of Mimotricentes subtrigonus'
- 'Mimotricentes mirielae belongs to Mimotricentes'
- 'Mioclaenus cuspidatus is recombined as Oxyclaenus cuspidatus'
- 'Mioclaenus ferox is recombined as Arctocyonides ferox'
- 'Mioclaenus filholianus is a subjective synonym of Oxyclaenus simplex'
- 'Mioclaenus lydekkerianus is a subjective synonym of Mioclaenus turgidus'
- 'Mioclaenus minimus is a subjective synonym of Promioclaenus acolytus'
- 'Mioclaenus pentacus is recombined as Loxolophus pentacus'
- 'Mioclaenus protogonioides is recombined as Desmatoclaenus protogonioides'
- 'Mioclaenus sectorius is recombined as Anisonchus sectorius'
- 'Mioclaenus turgidunculus is recombined as Promioclaenus turgidunculus'
- 'Neoclaenodon latidens is a subjective synonym of Arctocyonides montanensis'
- 'Neoclaenodon montanensis is recombined as Arctocyonides montanensis'
- 'Neoclaenodon procyonoides is recombined as Colpoclaenus procyonoides'
- 'Neoclaenodon silberlingi is recombined as Colpoclaenus silberlingi'
- 'Niphredil belongs to Pantolestidae'
- 'Niphredil radagasti belongs to Niphredil'
- 'Oxyacodon josephi belongs to Oxyacodon'
- 'Oxyacodon marshater belongs to Oxyacodon'
- 'Oxyacodon priscilla is a subjective synonym of Oxyacodon agapetillus'
- 'Oxyacodon tecumsae belongs to Oxyacodon'
- 'Oxyprimus belongs to Hyopsodontidae'
- 'Oxyprimus erikseni belongs to Oxyprimus'
- 'Oxyprimus galadrielae belongs to Oxyprimus'
- 'Oxyprimus putorius belongs to Oxyprimus'
- 'Oxytomodon is a subjective synonym of Litomylus'
- 'Oxytomodon perissum is recombined as Litomylus perissus'
- 'Pantinomia is a subjective synonym of Prothryptacodon'
- 'Pantinomia ambigua is recombined as Prothryptacodon ambiguus'
- 'Paradoxodon is a subjective synonym of Loxolophus'
- 'Paradoxodon belongs to ' according to Scott 1892
- 'Paradoxodonta is a subjective synonym of Loxolophus'
- 'Paradoxodonta belongs to ' according to Strand 1943
- 'Paschatherium petri is recombined as Dipavali petri'
- 'Periptychus coarctatus belongs to Periptychus'
- 'Periptychus matthewi is a subjective synonym of Periptychus coarctatus'
- 'Phenacodus grangeri is a subjective synonym of Phenacodus primaeous'
- 'Plagioptychus is a subjective synonym of Periptychus'
- 'Plagioptychus matthewi is a subjective synonym of Periptychus coarctatus'
- 'Platymastus belongs to Mesonychidae'
- 'Platymastus mellon belongs to Platymastus'
- 'Platymastus palantir belongs to Platymastus'
- 'Procerberus plutonis belongs to Procerberus'
- 'Promioclaenus wilsoni belongs to Promioclaenus'
- 'Prothryptacodon albertensis is recombined as Oxyprimus albertensis'
- 'Prothryptacodon albertensis belongs to Prothryptacodon' according to Fox 1968
- 'Protogonodon is a subjective synonym of Loxolophus'
- 'Protogonodon biathales is a subjective synonym of Loxolophus spiekeri'
- 'Protogonodon grangeri is a subjective synonym of Loxolophus pentacus'
- 'Protogonodon kimbetovius is recombined as Loxolophus kimbetovius'
- 'Protogonodon spiekeri is recombined as Loxolophus spiekeri'
- 'Protogonodon spiekeri belongs to Protogonodon' according to Gazin 1938
- 'Protogonodon stenognathus is a subjective synonym of Loxolophus pentacus'
- 'Protoselene bombadili belongs to Protoselene'
- 'Protungulatum gorgun belongs to Protungulatum'
- 'Protungulatum sloani belongs to Protungulatum'
- 'Ragnarok belongs to '
- 'Ragnarok harbichti belongs to Ragnarok'
- 'Ragnarok wovokae belongs to Ragnarok'
- 'Sarcothraustes is a subjective synonym of Triisodon'
- 'Sarcothraustes antiquus is a subjective synonym of Triisodon quivirensis'
- 'Sarcothraustes coryphaeus is recombined as Eoconodon coryphaeus'
- 'Spanoxyodon is a subjective synonym of Chriacus'
- 'Spanoxyodon latrunculus is a subjective synonym of Chriacus baldwini'
- 'Thangorodrim belongs to '
- 'Thangorodrim thalion belongs to Thangorodrim'
- 'Thryptacodon australis belongs to Thryptacodon'
- 'Thryptacodon belli is a subjective synonym of Thryptacodon demari'
- 'Thryptacodon loisi is a subjective synonym of Thryptacodon antiquus'
- 'Thryptacodon olseni is a subjective synonym of Thryptacodon antiquus'
- 'Thryptacodon pseudarctos is a subjective synonym of Thryptacodon antiquus'
- 'Tinuviel belongs to Periptychidae'
- 'Tinuviel eurydice belongs to Tinuviel'
- 'Tiznatzinia is a subjective synonym of Promioclaenus'
- 'Tiznatzinia vanderhoofi is recombined as Promioclaenus vanderhoofi'
- 'Tricentes is a subjective synonym of Chriacus'
- 'Tricentes crassicollidens is a subjective synonym of Chriacus baldwini'
- 'Tricentes latidens is a subjective synonym of Mimotricentes subtrigonus'
- 'Triisodon is a subjective synonym of Goniacodon'
- 'Triisodon conidens is a subjective synonym of Triisodon quivirensis'
- 'Triisodon heilprinianus is a subjective synonym of Conoryctes comma'
- 'Zetodon is a subjective synonym of Anisonchus'
- 'Zetodon gracilis is a subjective synonym of Anisonchus sectorius'
- 'Zetodon gracilis is recombined as Hemithlaeus gracilis' according to Matthew 1897
- 'Zetodon gracilis belongs to Zetodon' according to Cope 1883