COMPLETE LIST OF CLASSES AND ORDERS 68 

 Class Subcl Order 



Saurischia ^^* (Theropoda, Sauropoda, Compsognatha) tri-cre 



Omithischia (Orthopoda, Ornithopoda, Predentata tri-cre 



Stegosauria) 



Synapsida ^^^ pen-jur 



Pelycosauria pen-tri 



Therapsida ^^^ per-tri 



Ictidosauria tri-jur 



Mesosauria (Proganosauria) per 



AVES jur-rec 



Archaeornithes (Saururae) jur 



Archaeopteryges (Archaeopterygiformes) jur 



Neoraithes ^^^ (Ornithae, Ornithurae) cre-rec 



Hesperomithes (Odontolcae, Hesperornithijormes) cre-eoc 



Ichthyornithes (Odontormae, Ichthyornes, Ichthyor- cre 



nithijormes, Ichthyornijormes ) 



Sphenisci (Sphenisciformes, Impennes) oli-rec 



Caenagnathae (Coenagnathiformes) cre 



Struthiones {Struthioniformes) pli-rec 



Rheae (Rheiformes) pli-rec 



Casuarii (Casuariiformes) ple-rec 



Dinornithes (Dinornithiformes) ple 



Aepyornithes (Aepyornithiformes) eoc-ple 



Apteryges (Apterygiformes) ple-rec 



Crypturi (Tinami, Tinamijormes, Crypturiformes) pli-rec 



Gaviae (Gaviiformes) eoc-rec 

 Podicipedes (Podicipediformes, Podicipiformes, Colym- oli-rec 



bae, Colymbi formes, Pygopodes) 



Procellariae {Procellariijormes, Cecomorphae, Turbi- eoc-rec 

 nares, Tubinares) 



^^* Includes: Hallopoda. 



'^''^ Includes: Promammalia (Protodonta), at one time placed in subclass Proto- 

 theria, of Mammalia. 



^''^ Includes: Dromosauria, Deinocephalia, Dicynodontia, Theriodontia, Ano- 

 modontia, Theromorpha. 



^" Includes: Dromeognathae, Megistanes, Gastornithes, Stereornithes, Cari- 

 natae, Colymbomorphae, Pelargomorphae, Alectoromorphae, Coraciomorphae, 

 Limicolae, Pterocletes, Picariae, Musophagi. Neognathae (Euornithes) = all ex- 

 cept HESPERORNiTHEs ■\- ICHTHYORNITHES + IMPENNES. Superorder Odonto- 

 gnathae = hesperornithes (+ ichthyornithes). Superorder Palaeognathae = 

 caenagnathae + struthiones 4- rheae -1- casuarii + dinornithes 4- aepyor- 

 nithes -I- apteryges. Ratitae included struthiones, rheae, casuarii, dinor- 



