A new early Eocene primate, Tinimomys graybulliensis, is described from the early Eocene of Wyoming. The common paromomyid ancestor of both the new taxon and Micromomys silvercouleei has developed conspicuously enlarged fourth premolars, independently from those of Phenacolemur (sensu stricto) or other early Tertiary primates with similar adaptations.
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Frederick S. Szalay (1974) studied this question.