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Additional Fossil Evidence on the Differentiation of the Earliest Euprimates

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Additional Fossil Evidence on the Differentiation of the Earliest Euprimates View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by DigitalCommons@University of Nebraska University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln USGS Staff -- Published Research US Geological Survey 1991 Additional fossil evidence on the differentiation of the earliest euprimates Kenneth D. Rose Johns Hopkins University School of Medicine, [email protected] Thomas M. Bown U.S. Geological Survey Follow this and additional works at: https://digitalcommons.unl.edu/usgsstaffpub Part of the Earth Sciences Commons Rose, Kenneth D. and Bown, Thomas M., "Additional fossil evidence on the differentiation of the earliest euprimates" (1991). USGS Staff -- Published Research. 207. https://digitalcommons.unl.edu/usgsstaffpub/207 This Article is brought to you for free and open access by the US Geological Survey at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in USGS Staff -- Published Research by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Proc. Natl. Acad. Sci. USA Vol. 88, pp. 98-101, January 1991 Evolution Additional fossil evidence on the differentiation of the earliest euprimates (Omomyidae/Adapidae/Steinius/primate evolution) KENNETH D. ROSE* AND THOMAS M. BOWNt *Department of Cell Biology and Anatomy, The Johns Hopkins University School of Medicine, Baltimore, MD 21205; and tU.S. Geological Survey, Paleontology and Stratigraphy Branch, Denver, CO 80225 Communicated by Elwyn L. Simons, October 1. 1990 ABSTRACT Several well-preservedjaws ofthe rare North Table 1. U.S. Geological Survey (USGS) samples American omomyid primate Steinius vespertinus, including the Finder of first known antemolar dentitions, have been discovered in 1989 USGS no. Description sample and 1990 in the early Eocene Willwood Formation of the Bighorn Basin, Wyoming. They indicate that its dental formula 25026 Right dentary with P4-M3 S. J. Senturia is as primitive as those in early Eocene Donrussellia (Adapidae) and anterior alveoli and Teilhardina (Omomyidae)-widely considered to be the 25027 Right dentary with P3-M3 M. Shekelle most primitive known euprimates-and that in various dental 25028 Left dentary with P3-P4 J. J. Rose characters Steinius is as primitive or more so than Teilhardina. 28325 Left dentary with P3-P4 H. H. Covert Therefore, despite its occurrence at least 2 million years later and anterior alveoli than Teilhardina, S. vespertinus is the most primitive known 28326 Left dentary with P3-M1 T. M. Bown omomyid and one of the most primitive known euprimates. Its 28466 Isolated right M2 primitive morphology further diminishes the dental distinc- 28472 Isolated left M1 tions between Omomyidae and Adapidae at the beginning ofthe 28473 Isolated right P4 euprimate radiation. advanced Teilhardina) are known to have had four lower Researchers are unanimous that the primate families Omo- premolars. Teilhardina dental characters are derived com- myidae and Adapidae represent the oldest and most primitive pared with Donrussellia in having the lower canine and P1 known "primates of modem aspect" (euprimates) (1-8), relatively more reduced, P2 diminutive and one-rooted, P3 even though their precise relationships to living primates and P4 anteroposteriorly shorter, and M3 reduced (18, 20, 26). remain controversial. Although Plesiadapiformes may be Hence adapids are generally more primitive dentally than related to Primates, their exclusion from the order is advo- omomyids. The postcranial skeleton in the oldest euprimates cated by a growing number of authors (9-14), and there is is poorly known and character polarities are equivocal. The general agreement that Euprimates is a holophyletic lade (3, consensus seems to be that tarsal anatomy of early adapids 11, 12, 15, 16). Hence Omomyidae and Adapidae are prob- is derived relative to that of omomyids (16, 27, 28), but some ably the oldest known members ofthe order to which humans authors maintain that adapids are postcranially more primi- belong. The most ancient omomyids and adapids appear tive (18, 29). abruptly in the early Eocene of North America (earliest Wasatchian) and Europe (earliest Sparnacian) (7, 17-20), Previously Unreported Material although an omomyid believed to be of late Paleocene age (Thanetian) has recently been reported from Morocco (21, Steinius vespertinus is a poorly known omomyid that has 22). been known up to now solely from a few fragmentary lower Apart from the new Moroccan form, the oldest and most and upper jaws from the early Eocene of Wyoming (20, 30, primitive unquestioned euprimates are the Euramerican 31). Several new specimens were recovered from the lower omomyid Teilhardina (variously assigned to Omomyiformes Eocene Willwood Formation of the Bighorn Basin, Wyo- or Tarsiiformes), the Euramerican adapid Cantius, and the ming, during the summer field seasons of 1989 and 1990 European adapid Donrussellia (the last two assigned to either (Table 1). Adapiformes or Lemuriformes); all are widely considered to All but one of the specimens come from a small quarry at lie near the base of the Euprimates (4, 8, 18-20, 23-25). All USGS fossil vertebrate locality D-1762; USGS 25028 is from three have a lower dental formula of 2-1-4-3, which is D-1859 [both localities at the 414-m level of the Willwood primitive for euprimates. Adapids generally differ from omo- Formation (32)]. myids dentally in having small vertical incisors (also present These specimens preserve evidence ofthe lower antemolar in some omomyids), I1 smaller than I2; unreduced canine; dentition, including several features in which S. vespertinus four premolars, P2 two-rooted, P3 and P4 narrow and elon- is equally or more primitive than T. belgica and T. americana gate; and molar M3 unreduced-most or all of which are (Figs. 1-3): a relatively large canine alveolus; two premolar believed to be primitive characters for Euprimates (4, 6). It alveoli between P3 and the canine; simple, uninflated, and is now known that the most primitive species of Teilhardina, elongate P3 and P4 (Table 2); P3 relatively tall and unreduced; Teilhardina belgica and Teilhardina americana, like primi- and P4 with a distinct, low metaconid. tive adapids, had small incisors (based on alveoli and known The alveoli of the incisors are preserved in USGS 25026 only for T. belgica), a moderately large canine, and four (Fig. 2). Although the lateral side of the dentary is broken premolars (18, 20). No other omomyids (including more away at the front, it is clear that I, was larger than I2, and its alveolus is slightly larger than that for the canine. The The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" Abbreviations: USGS, U.S. Geological Survey; I, incisor; P, pre- in accordance with 18 U.S.C. §1734 solely to indicate this fact. molar; M, molar. 98 Evolution: Rose and Bown Proc. Nati. Acad. Sci. USA 88 (1991) 99 A- ma ' FIG. 1. Left lower dentitions of early euprimates in occlusal (Left) and lingual (Right) views. (A) S. vespertinus, showing P3-M3 and alveoli for canine, P1, and P2 [based on holotype (American Museum ofNatural History 16835), USGS 28325, and USGS 28326]. (B) T. americana with canine and P2-M3 (holotype, University of Wyoming 6896; PI alveolus restored from University of Michigan nos. 75610 and 77391). (C) Donrussellia provincialis with Ml-M3 (Musdum National d'Histoire Naturelle, Paris, RI 170); P4 and anterior alveoli as reported by Godinot (19, 33). (D) Omomys carteri with canine, P2-M3 [based on Yale Peabody Museum nos. 11805 and 13209; C-P3 as reported by Szalay (18)]. (Bars =1mm.) alveolus tapers beneath the canine socket, and the dentary is larger relative to P4 than in Teilhardina. P4 has a small, low shallower anteriorly; consequently, I1 must have been com- paraconid and ahigher, more prominent metaconid; the latter paratively smaller than in Tetonius or advanced Teilhardina is, however, relatively low, comparing -closely with the (although apparently larger than in T. belgica). The alveolus metaconid elevation in T. americana. for I2 was displaced laterally relative to I and the canine. Steinius also closely resembles the adapid Donrussellia in In analogy with Teilhardina, the anterior premolar alveoli several of the primitive euprimate characters listed above of Steinius are interpreted to have held one-rooted P1 and P2 (unreduced canine, presence of four premolars, uninflated rather than a two-rooted P2 and no P1; hence, the lowerdental and elongate P3 4, P4 with low metaconid) as well as in having formula was 2-1-4-3. This interpretation is favored because relatively broad molar talonid basins with peripheral cusps no early euprimate is known to have lost P1 while retaining and no basal inflation and a less reduced M3 than in Teilhar- a two-rooted P2; however, early adapids retained P1 together dina. Only in having a somewhat enlarged I, is Steinius with a two-rooted P2. Judging from its alveolus, P1 in S. apparently more derived than the most primitive Teilhardina. vespertinus was relatively at least as large as or larger than Donrussellia is more primitive than Steinius (and Teilhar- that in Teilhardina and was also displaced laterally.-In USGS dina) in having narrower and more elongate P34 (Table 1), a 28325 the P1 alveolus is approximately the same size as that two-rooted P2, more acute molar cusps, and more separated for P2, but most ofthe alveolus lies buccal to the median axis molar paraconids and metaconids (especially on M2). of the tooth row. P1 in USGS 25026 appears to be smaller Thus, S. vespertinus appears to be the most primitive (Fig. 2), but this is probably an artifact of breakage of the known omomyid and, as such, it helps to clarify the polarity lateral side ofthe dentary and not a true indication ofthe size of dental characters in basal euprimates. Aforementioned of this tooth.
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