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Work of the past fifty years, or so, has shed much additional light on the phylogeny and history of the Order Rodentia. Classical views have been challenged, and new concepts invoked, or older views rediscovered. Of these new concepts, hystricomorphy, rather than protrogomorphy, as a primitive state for rodents seems difficult to accept, and is not really new. Hystricognathy versus sciurognathy as the fundamental division of the Rodentia seems perilous if pardlelism is as important a phenomenon as is frequently suggested. The argument for multiserial incisor enamel, rather than pauciserial, as the primitive incisor kind is very persuasive, but...

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