Abstract
The anatomy of the posterior basicranium has been repeatedly invoked in systematic definitions of Primates. One widely cited definition1,2 of the order claims that ‘all undoubted primates’3 are distinguished from other mammals by two basicranial specializations: (1) absence of a major vascular foramen on the medial side of the auditory region, and (2) development of the auditory bulla from the petrosal bone. As we show here, specialization (1) does not apply to the paromomyid Ignacius, and is of uncertain incidence in other unquestioned members of suborder Plesiadapiformes (archaic primates from the early Cenozoic of Europe and North America). Specialization (2) cannot be demonstrated without ontogenetic evidence, and all relevant plesiadapiform fossils are adult. In fact, the only plesiadapiform with an arterial pattern remotely resembling that of early primates of modern aspect (or ‘euprimates’4) is the microsyopid Cynodontomys, but it is often regarded as non-primate because it lacks a petrosal bulla. Although plesiadapiforms resemble euprimates in traits of the cheek teeth and postcranium5–7, some other (presumably non-primate) groups possess these traits as well. Since the order Primates is not clearly definable by unique specializations, the best grounds for regarding plesiadapiforms as euprimate antecedents are stratigraphic and phenetic. This fact may be best expressed by systematic arrangements that emphasize adaptive grades rather than unsubstantiated clades.
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References
Szalay, F. S. in Phytogeny of the Primates, a Multidisciplinary Approach (eds Luckett, W. P. & Szalay, F. S.) 91–125 (Plenum, New York, 1975).
Szalay, F. S. & Delson, E. Evolutionary History of the Primates (Academic, New York, 1979).
Szalay, F. S. in The Functional and Evolutionary Biology of Primates (ed. Tuttle, R.) 3–35 (Aldine, Chicago, 1972).
Hoffstetter, R. Bull. Mém. Soc. Anthrop. Paris (sér. 13) 4, 327–347 (1977).
Simpson, G. G. Am. Mus. Novit. 816, 1–30 (1935).
Szalay, F. S. Evolution 22, 19–36 (1968).
Gingerich, P. D. Pap. Paleontol. Univ. Michigan Mus. Paleontol. 15, 1–140 (1976).
Archibald, J. D. J. hum. Evol. 6, 609–622 (1977).
McKenna, M. C. Folia primatol. 4, 1–25 (1966).
Szalay, F. S. Bull Am. Mus. nat. Hist. 140, 193–330 (1969).
Saban, R. Mém. Mus. natn Hist. nat., Paris (sér. A) 29, 1–278 (1963).
Russell, D. E. Mém. Mus. natn Hist. nat., Paris (sér. C) 13, 1–324 (1964).
Szalay, F. S. Am. J. phys. Anthrop. 36, 59–76 (1972).
MacPhee, R. D. E. Contr. Primatol. 18, 1–282 (1981).
Cartmill, M. in Phyhgeny of the Primates, a Multidisciplinary Approach (eds Luckett, W. P. & Szalay, F. S.) 313–354 (Plenum, New York, 1975).
Story, H. E. Fieldiana, Zool. 32, 477–557 (1951).
Guthrie, D. A. Bull. Mus. comp. Zool. 128, 455–481 (1963).
Bugge, J. Acta anat. (Suppl. 62) 87, 1–160 (1974).
Butler, H. Int. J. Primatol. 1, 333–343 (1980).
Presley, R. Acta anat. 103, 238–244 (1979).
Cartmill, M. & MacPhee, R. D. E. in Comparative Biology and Evolutionary Relationships of Tree Shrews (ed. Luckett, W. P.) 95–132 (Plenum, New York, 1980).
Van Valen, L. Evolution 19, 137–151 (1965).
Szalay, F. S. J. hum. Evol. 6, 3–18 (1977).
MacPhee, R. D. E. Folia primatol. 31, 23–47 (1979).
Klaauw, C. J. van der Bull. Am. Mus. nat. Hist. 62, 1–352 (1931).
Szalay, F. S. & Decker, R. L. in Primate Locomotion (ed. Jenkins, F. A.) 223–259 (Academic, New York, 1974).
Szalay, F. S., Tattersall, I. & Decker, R. L. Contr. Primatol. 5, 136–166 (1975).
Szalay, F. S. & Drawhorn, G. in Comparative Biology and Evolutionary Relationships of Tree Shrews (ed. Luckett, W. P.) 133–169 (Plenum, New York, 1980).
Lewis, O. J. J. Anat. 131, 275–298 (1980).
Novacek, M. J. in Comparative Biology and Evolutionary Relationships of Tree Shrews (ed. Luckett, W. P.) 35–93 (Plenum, New York, 1980).
Cartmill, M. in A History of American Physical Anthropology 1930–1980 (ed. Spencer, F.) 147–186 (Academic, New York, 1982).
Gingerich, P. D. J. hum. Evol. 10, 345–374 (1981).
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MacPhee, R., Cartmill, M. & Gingerich, P. New Palaeogene primate basicrania and the definition of the order Primates. Nature 301, 509–511 (1983). https://doi.org/10.1038/301509a0
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DOI: https://doi.org/10.1038/301509a0
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