Abstract
A new specimen of Dyseolemur pacificus Stock, 1934, represents the most complete dentition known for any North American omomyid primate. Crowns are preserved from each tooth position except I2 on either the right or left side, or both. The specimen comes from the upper part of the Santiago Formation near Oceanside, San Diego County, California, and is of middle Eocene (late Uintan) age. The crowns of the anterior teeth are tarsiiform in shape (they are high and pointed, tapering from base to tip). The size relationships among the anterior teeth differ from those of many omomyids in having relatively large canines and small incisors, a pattern that is similar to anthropoids and adapids. Despite this similarity, the crowns of these teeth in Dyseolemur are unmistakably tarsiiform in structure. The implications of these results are discussed in the light of recently published hypothetical phylogenies concerning the origin of anthropoids and the origin of modern Tarsius .
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