Opinions from E. D. Cope 1875
- 'Abastor belongs to Colubridae'
- 'Acontiidae belongs to Typhlophthalmi'
- 'Acris belongs to Hylidae'
- 'Acrochordidae [misspelled as Achrochordidae] belongs to Colubroidea'
- 'Adocidae belongs to Cryptodira'
- 'Agamidae belongs to Pachyglossa'
- 'Aglossa belongs to Anura'
- 'Alligator belongs to Crocodilidae'
- 'Amblystoma belongs to Amblystomidae'
- 'Ambystomatidae [misspelled as Amblystomidae] belongs to Urodela'
- 'Amphicoelia belongs to Crocodilia'
- 'Amphisbaenidae belongs to Opheosauri'
- 'Amphiuma belongs to Amphiumidae'
- 'Amphiuma means belongs to Amphiuma'
- 'Amphiumidae belongs to Urodela'
- 'Amyda belongs to Trionychidae'
- 'Aneides [misspelled as Anaides] belongs to Plethodontidae'
- 'Anelytropidae is a subjective synonym of Feyliniidae'
- 'Anguidae belongs to Diploglossa'
- 'Aniliidae [misspelled as Aniellidae] belongs to Typhlophthalmi'
- 'Ankistrodon [misspelled as Ancistrodon] belongs to Crotalidae'
- 'Anniella belongs to Aniellidae'
- 'Anolidae belongs to Iguania'
- 'Anolis belongs to Anolidae'
- 'Anomodontia belongs to Reptilia'
- 'Anthracosauridae belongs to Labyrinthodontia'
- 'Anuri is corrected as Anura and belongs to Batrachia'
- 'Aploaspis belongs to Crotalidae'
- 'Arcifera belongs to Anura'
- 'Aromochelys belongs to Cinosternidae'
- 'Asinea belongs to Ophidia'
- 'Aspidonectes belongs to Trionychidae'
- 'Asterophrydidae belongs to Arcifera'
- 'Athecae belongs to Testudinata'
- 'Atractaspididae belongs to Solenoglypha'
- 'Baphetidae belongs to Labyrinthodontia'
- 'Barissia belongs to Gerrhonotidae'
- 'Bascanium belongs to Colubridae'
- 'Batrachophrynidae belongs to Bufoniformia'
- 'Batrachoseps belongs to Plethodontidae'
- 'Belodontidae belongs to Parasuchia'
- 'Boidae belongs to Peropoda'
- 'Brevicipitidae is corrected as Breviceptidae and belongs to Firmisternia'
- 'Bufo belongs to Bufonidae'
- 'Bufonidae belongs to Bufoniformia'
- 'Bufoniformia belongs to Anura'
- 'Caeciliidae belongs to Gymnophidia'
- 'Callisaurus belongs to Iguanidae'
- 'Carphophis [misspelled as Carphophiops] belongs to Colubridae'
- 'Carphophis amoenus [misspelled as Carphophiops amoenus] belongs to Carphophiops'
- 'Caudisonia belongs to Crotalidae'
- 'Caudisonia lepida is recombined as Aploaspis lepida'
- 'Causidae belongs to Solenoglypha'
- 'Cemophora belongs to Colubridae'
- 'Chalcididae is corrected as Chalcidae and belongs to Leptoglossa'
- 'Chamaeleonidae is corrected as Chamaeleontidae and belongs to Rhiptoglossa'
- 'Charina belongs to Boidae'
- 'Chelonia belongs to Cheloniidae'
- 'Cheloniidae belongs to Cryptodira'
- 'Chelopus belongs to Emydidae'
- 'Chelydidae belongs to Pleurodira'
- 'Chelydra belongs to Chelydridae'
- 'Chelydridae belongs to Cryptodira'
- 'Chilomeniscus belongs to Colubridae'
- 'Chilopoma belongs to Colubridae'
- 'Chionactis belongs to Colubridae'
- 'Chorophilus belongs to Hylidae'
- 'Chrysemys belongs to Emydidae'
- 'Cimoliasaurus belongs to Elasmosauridae'
- 'Cistudo belongs to Emydidae'
- 'Cnemidophorus belongs to Teidae'
- 'Cocytinidae belongs to Urodela'
- 'Cocytinus belongs to Cocytinidae'
- 'Coleonyx belongs to Gecconidae'
- 'Colosteidae belongs to Ganocephala'
- 'Colostethidae belongs to Raniformia'
- 'Colosteus belongs to Colosteidae'
- 'Coluber belongs to Colubridae'
- 'Coluber abacura is recombined as Farancia abacura'
- 'Coluber leberis is recombined as Tropidonotus leberis'
- 'Coluber melanoleucus [misspelled as Pityophis melanoleucus] belongs to Pityophis'
- 'Coluber platyrhinos [misspelled as Heterodon platyrhinus] belongs to Heterodon'
- 'Coluber simus is recombined as Heterodon simus'
- 'Colubridae belongs to Colubroidea'
- 'Colubroidea belongs to Asinea'
- 'Compsognatha is a subjective synonym of Symphypoda'
- 'Compsognathidae belongs to Symphypoda'
- 'Compsognathus belongs to Compsognathidae'
- 'Coniophanes belongs to Colubridae'
- 'Conocerca belongs to Proteroglypha'
- 'Contia belongs to Colubridae'
- 'Crocodilia belongs to Reptilia'
- 'Crocodilus mississippiensis is recombined as Alligator mississippiensis'
- 'Crocodylidae is corrected as Crocodilidae and belongs to Procoelia'
- 'Crocodylus [misspelled as Crocodilus] belongs to Crocodilidae'
- 'Crotalinae was reranked as the family Crotalidae and belongs to Solenoglypha'
- 'Crotalus belongs to Crotalidae'
- 'Crotalus adamanteus belongs to Crotalus'
- 'Crotalus horridus belongs to Crotalus'
- 'Crotaphytus belongs to Iguanidae'
- 'Cryptodira belongs to Testudinata'
- 'Cyclophis belongs to Colubridae'
- 'Cyclura belongs to Iguanidae'
- 'Cystignathidae belongs to Arcifera'
- 'Dactylethridae belongs to Odontaglossa'
- 'Dendrobatidae belongs to Firmisternia'
- 'Desmognathinae was reranked as the family Desmognathidae and belongs to Urodela'
- 'Desmognathus belongs to Desmognathidae'
- 'Desmognathus ochrophaeus is corrected as Desmognathus ochrophaea and belongs to Desmognathus'
- 'Diadophis belongs to Colubridae'
- 'Diadophis punctatus belongs to Diadophis'
- 'Dicamptodon belongs to Amblystomidae'
- 'Dicynodontidae belongs to Anomodontia'
- 'Diemyctylus belongs to Pleurodelidae'
- 'Dimorphodontidae belongs to Ornithosauria'
- 'Dinosauria belongs to Reptilia'
- 'Diplodactylus belongs to Gecconidae'
- 'Diploglossa belongs to Pleurodonta'
- 'Dipsosaurus belongs to Iguanidae'
- 'Discoglossidae belongs to Arcifera'
- 'Dromicus belongs to Colubridae'
- 'Elapidae belongs to Conocerca'
- 'Elaps belongs to Elapidae'
- 'Elasmosauridae belongs to Sauropterygia'
- 'Elasmosaurus belongs to Elasmosauridae'
- 'Emydidae belongs to Cryptodira'
- 'Emys belongs to Emydidae'
- 'Engystoma belongs to Engystomidae'
- 'Engystomidae belongs to Firmisternia'
- 'Epirhexis belongs to Cystignathidae'
- 'Eretmochelys belongs to Cheloniidae'
- 'Eumeces belongs to Scincidae'
- 'Eumeces fasciatus belongs to Eumeces'
- 'Eutaenia belongs to Colubridae'
- 'Farancia belongs to Colubridae'
- 'Feyliniidae belongs to Typhlophthalmi'
- 'Firmisternia belongs to Anura'
- 'Ganocephala was reranked as a suborder and belongs to Stegocephali'
- 'Gastrechmia belongs to Anura'
- 'Gekkonidae [misspelled as Gecconidae] belongs to Nyctisaura'
- 'Gerrhonotidae belongs to Diploglossa'
- 'Gerrhonotus belongs to Gerrhonotidae'
- 'Goniopholididae belongs to Amphicoelia'
- 'Goniopholis belongs to Goniopholididae'
- 'Goniopoda was reranked as a suborder and belongs to Dinosauria'
- 'Gyalopion is corrected as Gyalopium and belongs to Colubridae'
- 'Gymnophidia belongs to Batrachia'
- 'Gyrinophilus belongs to Plethodontidae'
- 'Hadrosauridae belongs to Orthopoda'
- 'Haldea belongs to Colubridae'
- 'Harpagmosauria is a subjective synonym of Goniopoda'
- 'Hatteriidae is a subjective synonym of Sphenodontidae'
- 'Helicops belongs to Colubridae'
- 'Heloderma belongs to Helodermidae'
- 'Helodermatidae [misspelled as Helodermidae] belongs to Diploglossa'
- 'Hemidactylium belongs to Plethodontidae'
- 'Hemiphractinae was reranked as the family Hemiphractidae and belongs to Arcifera'
- 'Hemisidae belongs to Gastrechmia'
- 'Heterodon belongs to Colubridae'
- 'Holbrookia belongs to Iguanidae'
- 'Homalopsinae was reranked as the family Homalopsidae and belongs to Colubroidea'
- 'Hydraspididae belongs to Pleurodira'
- 'Hydrophidae belongs to Platycerca'
- 'Hyla belongs to Hylidae'
- 'Hyla gratiosa belongs to Hyla'
- 'Hyla squirella belongs to Hyla'
- 'Hyla versicolor belongs to Hyla'
- 'Hylidae belongs to Arcifera'
- 'Hynobiidae belongs to Urodela'
- 'Hypsiglena belongs to Colubridae'
- 'Ichthyopterygia belongs to Reptilia'
- 'Ichthyosauridae belongs to Ichthyopterygia'
- 'Iguania belongs to Pleurodonta'
- 'Iguanidae belongs to Iguania'
- 'Iguanodontidae belongs to Orthopoda'
- 'Kinosternoidea [misspelled as Cinosternidae] belongs to Cryptodira'
- 'Kinosternon [misspelled as Cinosternum] belongs to Cinosternidae'
- 'Labyrinthodontia was reranked as a suborder and belongs to Stegocephali'
- 'Lacerta sexlineata is recombined as Cnemidophorus sexlineatus'
- 'Lacertidae belongs to Leptoglossa'
- 'Lacertilia belongs to Reptilia'
- 'Lepidosternum floridana is recombined as Rhineura floridana'
- 'Lepterpeton belongs to Ptyoniidae'
- 'Leptoglossa belongs to Pleurodonta'
- 'Lichanura belongs to Lichanuridae'
- 'Lichanuridae belongs to Peropoda'
- 'Lithodytes belongs to Cystignathidae'
- 'Lodia belongs to Colubridae'
- 'Macrochelys belongs to Chelydridae'
- 'Malacoclemmys belongs to Emydidae'
- 'Manculus belongs to Plethodontidae'
- 'Megalosauri is corrected as Megalosauridae and belongs to Goniopoda'
- 'Menopoma belongs to Menopomidae'
- 'Menopomidae belongs to Urodela'
- 'Microsauria was reranked as a suborder and belongs to Stegocephali'
- 'Molgophidae belongs to Microsauria'
- 'Molgophis belongs to Molgophidae'
- 'Mosasauridae belongs to Pythonomorpha'
- 'Muraenopsis belongs to Amphiumidae'
- 'Najidae belongs to Conocerca'
- 'Necturus belongs to Proteidae'
- 'Nothosaurus belongs to Plesiosauridae'
- 'Nyctisaura belongs to Lacertilia'
- 'Odontaglossa belongs to Anura'
- 'Oestocephalus belongs to Ptyoniidae'
- 'Oligosoma belongs to Scincidae'
- 'Ophibolus belongs to Colubridae'
- 'Ophidia belongs to Reptilia'
- 'Ophiosauri [misspelled as Opheosauri] belongs to Lacertilia'
- 'Ophisaurus [misspelled as Opheosaurus] belongs to Anguidae'
- 'Ophisaurus ventralis [misspelled as Opheosaurus ventralis] belongs to Opheosaurus'
- 'Ornithosauria belongs to Reptilia'
- 'Ornithoscelida is a subjective synonym of Dinosauria'
- 'Ornithotarsidae belongs to Symphypoda'
- 'Ornithotarsus belongs to Ornithotarsidae'
- 'Orthopoda belongs to Dinosauria'
- 'Osceola belongs to Colubridae'
- 'Oudenodontidae belongs to Anomodontia'
- 'Pachyglossa belongs to Lacertilia'
- 'Pachypodes is a subjective synonym of Dinosauria'
- 'Parasuchia belongs to Crocodilia'
- 'Pelion belongs to Peliontidae'
- 'Peliontidae belongs to Microsauria'
- 'Pelodytidae belongs to Arcifera'
- 'Pelomedusidae belongs to Pleurodira'
- 'Peropoda belongs to Asinea'
- 'Phimothyra belongs to Colubridae'
- 'Phlegethontiidae belongs to Microsauria'
- 'Phryniscidae belongs to Firmisternia'
- 'Phrynosoma belongs to Iguanidae'
- 'Phyllodactylus belongs to Gecconidae'
- 'Pipidae belongs to Aglossa'
- 'Pistosaurus belongs to Plesiosauridae'
- 'Pituophis [misspelled as Pityophis] belongs to Colubridae'
- 'Placodontidae belongs to Sauropterygia'
- 'Placodus belongs to Placodontidae'
- 'Plateosaurus belongs to Teratosauridae'
- 'Platycerca belongs to Proteroglypha'
- 'Platythyra flavescens [misspelled as Cinosternum flavescens] belongs to Cinosternum'
- 'Plesiosauridae belongs to Sauropterygia'
- 'Plesiosaurus belongs to Plesiosauridae'
- 'Plesiosaurus (Pleiosaurus) was reranked as Pliosaurus and belongs to Plesiosauridae'
- 'Plethodon belongs to Plethodontidae'
- 'Plethodon glutinosus belongs to Plethodon'
- 'Plethodontidae belongs to Urodela'
- 'Pleurodelidae belongs to Urodela'
- 'Pleurodira belongs to Testudinata'
- 'Pleurodonta belongs to Lacertilia'
- 'Pleurosternidae belongs to Cryptodira'
- 'Podocnemididae belongs to Pleurodira'
- 'Procoelia belongs to Crocodilia'
- 'Propleuridae belongs to Cryptodira'
- 'Proteidae belongs to Proteida'
- 'Proteoidea was reranked as the order Proteida and belongs to Batrachia'
- 'Proteroglypha belongs to Ophidia'
- 'Protorosauridae belongs to Rhynchocephalia'
- 'Protorosaurus belongs to Protorosauridae'
- 'Protostega belongs to Protostegidae'
- 'Protostegidae belongs to Athecae'
- 'Pseudemys belongs to Emydidae'
- 'Pseudobranchus belongs to Sirenidae'
- 'Pterodactylidae belongs to Ornithosauria'
- 'Ptyoniidae belongs to Microsauria'
- 'Pythoninae was reranked as the family Pythonidae and belongs to Peropoda'
- 'Pythonomorpha belongs to Reptilia'
- 'Rana gryllus is recombined as Acris gryllus'
- 'Rana holbrookii is recombined as Scaphiopus holbrookii'
- 'Ranidae belongs to Raniformia'
- 'Raniformia belongs to Anura'
- 'Rhabdosomidae belongs to Colubroidea'
- 'Rhineura belongs to Amphisbaenidae'
- 'Rhinocheilus [misspelled as Rhinochilus] belongs to Colubridae'
- 'Rhinophrynidae belongs to Bufoniformia'
- 'Rhiptoglossi is corrected as Rhiptoglossa and belongs to Lacertilia'
- 'Rhynchocephalia belongs to Reptilia'
- 'Rhynchosauridae belongs to Rhynchocephalia'
- 'Rhynchosaurus belongs to Rhynchosauridae'
- 'Salamandra porphyritica is recombined as Gyrinophilus porphyriticus'
- 'Salamandra porphyritica belongs to Salamandra' according to Green 1827
- 'Salamandridae belongs to Urodela'
- 'Salientia is a subjective synonym of Anura'
- 'Sauromalus belongs to Iguanidae'
- 'Sauropterygia was reranked as a order and belongs to Reptilia'
- 'Scaphiopodidae [misspelled as Scaphiopidae] belongs to Arcifera'
- 'Scaphiopus belongs to Scaphiopidae'
- 'Scaphiopus bombifrons is recombined as Spea bombifrons'
- 'Scaphiopus couchii belongs to Scaphiopus'
- 'Scaphiopus hammondi is recombined as Spea hammondii'
- 'Scaphiopus multiplicatus is recombined as Spea multiplicata'
- 'Scelidosauridae belongs to Orthopoda'
- 'Sceloporus belongs to Iguanidae'
- 'Scincidae belongs to Leptoglossa'
- 'Scolecophidia was reranked as a suborder and belongs to Ophidia'
- 'Sepsidae belongs to Leptoglossa'
- 'Sibon belongs to Colubridae'
- 'Siren belongs to Sirenidae'
- 'Siren lacertina belongs to Siren'
- 'Sirenidae belongs to Trachystomata'
- 'Smilisca belongs to Hylidae'
- 'Solenoglypha belongs to Ophidia'
- 'Sonora belongs to Colubridae'
- 'Spea belongs to Scaphiopidae'
- 'Spelerpes belongs to Plethodontidae'
- 'Sphaerodactylus belongs to Gecconidae'
- 'Sphargididae belongs to Athecae'
- 'Sphargis belongs to Sphargididae'
- 'Sphenodontidae belongs to Rhynchocephalia'
- 'Spilotes belongs to Colubridae'
- 'Stegocephali belongs to Batrachia'
- 'Stellio undulatus is recombined as Sceloporus undulatus'
- 'Stenostoma belongs to Stenostomidae'
- 'Stenostomidae belongs to Scolecophidia'
- 'Stereochilus belongs to Plethodontidae'
- 'Stereochilus marginatum belongs to Stereochilus' according to Cope 1869
- 'Stereochilus marginatum belongs to Stereochilus'
- 'Sternothaeridae belongs to Pleurodira'
- 'Storeria belongs to Colubridae'
- 'Symphypoda was reranked as a suborder and belongs to Dinosauria'
- 'Tantilla belongs to Colubridae'
- 'Teiidae [misspelled as Teidae] belongs to Leptoglossa'
- 'Teleosauridae belongs to Amphicoelia'
- 'Teratosauridae belongs to Goniopoda'
- 'Teratosaurus belongs to Teratosauridae'
- 'Terrapene ornata is recombined as Cistudo ornata'
- 'Testudinata belongs to Reptilia'
- 'Testudinidae belongs to Cryptodira'
- 'Testudo belongs to Testudinidae'
- 'Testudo concinna is recombined as Pseudemys concinna'
- 'Testudo imbricata is recombined as Eretmochelys imbricata'
- 'Testudo mydas is recombined as Chelonia mydas'
- 'Testudo picta is recombined as Chrysemys picta'
- 'Testudo serpentina is recombined as Chelydra serpentina'
- 'Thalassochelys belongs to Cheloniidae'
- 'Thecaglossa belongs to Pleurodonta'
- 'Therosauria is a subjective synonym of Orthopoda'
- 'Thoracosauridae belongs to Procoelia'
- 'Thoracosaurus belongs to Thoracosauridae'
- 'Thoriidae belongs to Urodela'
- 'Tortix bottae is recombined as Charina bottae'
- 'Tortrices is corrected as Tortricidae and belongs to Tortricina'
- 'Tortricina belongs to Ophidia'
- 'Trachystomata belongs to Batrachia'
- 'Trimorphodon belongs to Colubridae'
- 'Trionychidae belongs to Cryptodira'
- 'Trogonophidae belongs to Opheosauri'
- 'Tropidoclonium belongs to Colubridae'
- 'Tropidonotus belongs to Colubridae'
- 'Tuditanidae belongs to Microsauria'
- 'Typhlophthalmi belongs to Pleurodonta'
- 'Typhlopidae belongs to Scolecophidia'
- 'Uma belongs to Iguanidae'
- 'Urocordylus belongs to Ptyoniidae'
- 'Urodeles was reranked as the order Urodela and belongs to Batrachia'
- 'Uropeltidae belongs to Tortricina'
- 'Uta belongs to Iguanidae'
- 'Varanidae belongs to Thecaglossa'
- 'Verticaria belongs to Scincidae'
- 'Viperidae belongs to Solenoglypha'
- 'Virginia belongs to Colubridae'
- 'Xantusia belongs to Lacertidae'
- 'Xantusiidae is a subjective synonym of Lacertidae'
- 'Xenopeltidae belongs to Peropoda'
- 'Xenosauridae belongs to Diploglossa'
- 'Zonuridae belongs to Leptoglossa'