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Cynosphenodon (SI-no-SPHEN-o-don) (Dog Sphenododontian) is an extinct genus of the family Sphenodontidae from the Middle Jurassic. Growth patterns in the teeth of Cynosphenodon suggest its close relationship with the modern tuatara. Based on dental structures, there is strong evidence that Cynosphenodon shared sister-group relationships to Sphenodon.

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