Cynodont Reptile with Incipient Mammalian Jaw Articulation

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Science  14 Nov 1969:
Vol. 166, Issue 3907, pp. 881-882
DOI: 10.1126/science.166.3907.881


A diagnostic mammalian character is jaw articulation between squamosal and dentary bones, replacing the quadrate-articular joint of reptiles. A newly discovered Argentinian Middle Triassic form shows, for the first time in an ancestral reptile, definite evidence of a squamosal-dentary articulation supplementary to the persistent primitive connection.

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