Reptiles Mammals
1 Single occipital condyle Double occipital condyle
2 Undifferentiated dentition Differentiated dentition
3 No secondary palate secondary palate
4 No diaphram Diaphram
5 Uncrowned, uncuspate teeth Crowned, cuspate teeth
6 Teeth with single root Teeth with multiple roots
7 Lower jaw of several bones lower jaw of dentary bone only
8 Jaw joint quadrate-articular Jaw joint dentary-squamosal
9 Lumbar region with ribs Lumbar region free
10 Separate clavical ribs Fused clavical ribs
11 Flat scapular Strong spine on scapular
12 Pelvic elements separate Pelvic elements fused
13 Limbs out from body Limbs under body
14 Cold blooded Warm blooded
15 Scales fur/hair
16 Joined external nares Separate external nares
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