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…showed last 75 words of 480 total…all mammals developed their cusp patterns from this pattern. What this paper ends up doing is answering the question by stating that all cusp patterns originated with this group of reptiles. It basically provided an overview of the tritubercular theory and traced primate cusp patterns back to reptilian origins and eventually to the first time the familiar Y-5 pattern shows up, with the finding of an early hominoid, Dryopithecus ( according to this paper). ------------------------------------------------------------------------ **Bibliography**