龟的分类

龟的分类方法有许多，以下为三种龟鳖目（Testudines）和龟鳖亚纲（Testudinata）分类。

托马斯和谢弗，2010

下面显示的是托马斯和谢弗（Thomson and Shaffer）在2010年给出的进化分支图：^[1]

Pleurodira Pelomedusoides   Pelusios subniger   Pelomedusidae     Pelusios gabonensis     Pelusios williamsi         Pelomedusa subrufa     Pelusios sinuatus       Podocnemididae   Peltocephalus dumerilianus     Podocnemis unifilis     Podocnemis lewyana       Podocnemis expansa     Erymnochelys madagascariensis         Chelidae Chelodininae     Chelodina rugosa       Chelodina longicollis     Chelodina oblonga           Pseudemydura umbrina       Emydura subglobosa       Elseya dentata     Elseya latisternum     Rheodytes leukops       Elusor macrurus     Elseya purvisi         Elseya georgesi     Emydura macquarii                 Hydromedusa tectifera   Chelinae   Chelus fimbriata       Platemys platycephala       Mesoclemmys nasuta     Mesoclemmys gibba         Acanthochelys radiolata       Acanthochelys spixii     Acanthochelys pallidipectoris           Mesoclemmys hogei       Phrynops williamsi       Phrynops geoffroanus     Phrynops hilarii                     Trionychia   Carettochelys insculpta   Trionychidae Cyclanorbinae     Lissemys scutata     Lissemys punctata           Cycloderma frenatum     Cycloderma aubryi         Cyclanorbis senegalensis     Cyclanorbis elegans         Trionychinae     Trionyx triunguis         Pelochelys bibroni     Pelochelys cantorii         Chitra vandijki       Chitra indica     Chitra chitra                 Rafetus euphraticus       Apalone mutica       Apalone ferox     Apalone spinifera               Pelodiscus sinensis     Pelodiscus axenaria         Palea steindachneri       Dogania subplana       Amyda cartilaginea       Nilssonia gangetica       Nilssonia formosa     Nilssonia hurum                         见下文的鳄龟科（Chelydridae）、海龟总科（Chelonioidea）、动胸龟总科（Kinosternoidea）、平胸龟科（Platysternidae）、泽龟科（Emydidae）、陆龟科（Testudinidae）和地龟科（Geoemydidae）

斯特林，2010

下面显示的是斯特林（Sterli）在2010年给出的进化分支图：^[2]

Testudinata

†Proganochelys quenstedti     †Australochelyidae   †Palaeochersis talampayensis     †Australochelys africanus         †Proterochersis robusta       †Kayentachelys aprix     †Condorchelys antiqua     †Heckerochelys romani     †Indochelys spatulata         †Mongolochelys efremovi   †Meiolaniidae   †Meiolania platyceps     †Niolamia argentina         †Chubutemys copelloi       †Kallokibotion bajazidi       †Santanachelys gaffneyi       †Solnhofia parsonsi       †Plesiochelyidae   †Portlandemys macdowelli     †Plesiochelys solodurensis         †Dorsetochelys delairi     †Thalassemys moseri   Pleurosternidae   †Pleurosternon bullocki       †Glyptops plicatulus     †Dinochelys whitei       Baenidae   †Neurankylus eximius       †Trinitichelys hiatti       †Plesiobaena antiqua     †Boremys pulchra       †Baena arenosa     †Chisternon undulatum                   †Siamochelys peninsularis     †Xinjianchelys latimarginalis     见下文的龟鳖目（Testudines）

Testudines

†Hangaiemys hoburensis     †Judithemys sukhanovi       †Dracochelys bicuspis       †Sinemys lens     †Ordosemys leios             †Toxochelys latiremys     †Mesodermochelys undulatus     Dermochelys coriacea   Cheloniidae   Caretta caretta     Chelonia mydas               Platysternon megacephalum       †Mongolemys elegans     Emydidae   Chrysemys picta     Trachemys scripta         Geoclemys hamiltonii   Testudinidae   Gopherus polyphemus     Chelonoidis chilensis                   †Protochelydra zangerli   Chelydridae   Macroclemys temminckii     Chelydra serpentina           †Emarginachelys cretacea         †Baptemys wyomingensis     Dermatemys mawii     †Hoplochelys crassa   Kinosternidae   Staurotypus triporcatus       Sternotherus odoratus     Kinosternon flavescens               †Adocus beati       †Zangerlia neimongolensis     †Basilemys variolosa             †Peltochelys durlstoensis       †Anosteira ornata     Carettochelys insculpta   Trionychidae   Lissemys punctata       Apalone spinifera     Pelodiscus sinensis             †Sandownia harrisi   Pleurodira     †Platychelys oberndorferi     †Caribemys oxfordiensis     †Notoemys laticentralis     Chelidae     Phrynops geoffroanus     Chelus fimbriatus           Elseya dentata     Elseya latisternum         Chelodina oblonga     Chelodina longicollis         Pelomedusoides   Pelomedusa subrufa       Erymnochelys madagascariensis     Podocnemis expansa

乔伊斯，2007

下面显示的是乔伊斯（Joyce）在2007年给出的进化分支图：^[3]

Testudinata

Proganochelys quenstedti       Palaeochersis talampayensis     Australochelys africanus       Proterochersis robusta       Kayentachelys aprix         Meiolania platyceps     Mongolochelys efremovi         Kallokibotion bajazidi   Testudines     Platychelys oberndorferi       Caribemys oxfordiensis       Notoemys laticentralis   Pleurodira Chelidae   Elseya dentata     Phyrops geoffroanus     Chelodina siebenrocki     Pelomedusoides   Podocnemis expansa     Pelomedusa subrufa     Erymnochelys madagascariensis                   Dorsetochelys delairi   Paracryptodira Pleurosternidae   Pleurosternon bullocki       Glyptops plicatulus     Dinochelys whitei       Baenidae   Neurankylus eximius       Trinitichelys hiatti       Plesiobaena antiqua       Boremys pulchra       Baena arenosa     Chisternon undatum                 Eucryptodira   Plesiochelys solodurensis     Portlandemys mcdowelli         Solnhofia parsonsi         Thalassemys moseri     Sandownia harrisi       Santanachelys gaffneyi           Xinjiangchelys latimarginalis       Hangaiemys hoburensis         Judithemys sukhavoni       Dracochelys bicuspis       Sinemys lens     Ordosemys leios           见下文的曲颈龟亚目（Cryptodira）

Cryptodira

Toxochelys latiremis   Chelonioidea     Mesodermochelys undulatus     Dermochelys coriacea     Cheloniidae   Chelonia mydas     Caretta caretta               Protochelydra zangerli   Chelydridae   Chelydra serpentina     Macrochelys temmincki           Platysternon megacephalum         Mongolemys elegans   Testudinoidea   Gopherus polyphemus       Geoclemys hamiltoni     Chrysemys picta         Trionychoidea     Emarginachelys cretacea   Kinosternoidea     Baptemys wyomingensis     Dermatemys mawii         Hoplochelys crassa       Staurotypus triporcatus       Sternotherus odoratus     Kinosternon scorpioides             Pantrionychia Adocidae   Adocus beati       Basilemys variolosa     Zangerlia neimongolensis           Peltochelys durlstonensis   Trionychia Pancarettochelyidae   Pseudanosteria pulchra     Carettochelys insculpta     Trionychidae   Lisemys punctata     Apalone ferox