I Clas^Reptilia 
"sc.SY^SIDA Osborn 
or.C^ylosauria Cope 
sup^order-AHOMODOHTIA Owen 
/ 
I Theriodontia Owen * 
Thereoephalia Broom 
go* Cynodoiitia Owen 
4r* Bicynodontia Owen , 
lor. Plaoodontia 
|or. Sauropterygia Owen 
ISO. Simosauria 
feo. Plesiosauria 
Ipr. Testudinata 
feo. Pleurodira 
^ 0 . Cryptodira 
so. Trionychia 
I Sc. BIAPSIBA Osborn 
stperorder-BIAPTOSAURIA Psb 
0 r. Procolophonia Seeley 
Or. Protorosauria Seeley 
^pr. Proganosauria Baur 
Gnathodontia Owen 
0 ^. Pelycosauria Cope 
* «/ 
‘4 ^ ^ ■ 
•» 
