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Quantitative Variation in Elephant Dentitions: Implications for the Delimitation of Fossil Species

  • V. Louise Roth (a1)
Abstract

Dental measurements are commonly used in the diagnosis of fossil elephant species, yet elephant teeth develop slowly, within a highly dynamic context that enhances opportunities for physical deformation (or its subtler manifestation, quantitative phenotypic variation). This paper examines intraspecific variation in elephant teeth and compares it with variability in other mammals (83 species in 7 orders). I conclude that (1) male elephants tend to have slightly larger cheek teeth than females, though the difference is not marked; (2) of the full complement of six cheek teeth per jaw quadrant, no single tooth consistently varies less than the others (so on this basis, for taxonomic decisions no tooth is preferable to the customarily used M3 = tooth VI); (3) single-population samples vary less than more inclusive, geographically heterogeneous samples of elephant teeth; (4) although differential wear and eruption are important sources of variation in dental measurements, complete elephant teeth are consistently more variable in length and width than the cheek teeth of other mammals; (5) variability in dental dimensions of recognized fossil species of elephants is in general not grossly inconsistent with variability noted in modern elephants, but there are some exceptions. With the information and guidelines presented here, consideration of variability, and assessment of the statistical power permitted by available samples, can enhance confidence and precision in the delimitation of species and provide a firmer basis for macroevolutionary inferences.

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Beden, M. 1979. Les éléphants (Loxodonta et Elephas) d'Afrique orientale: systématique, phylogénie, intérět biochronique. Thèse de Doctorat d'État. L'Université de Poitiers, France.
Beden, M. 1983. Family Elephantidae. Pp. 40129In Harris, J. M., ed. Koobi Fora research project, vol. 2. Clarendon Press, Oxford.
Cooke, H.B.S. 1947. Variation in the molars of the living African elephant and a critical revision of the fossil Proboscidea of Southern Africa. American Journal of Science 245: 434457, 492–517.
Domning, D. P., and Hayek, L.-A.. 1984. Horizontal tooth replacement in the Amazonian manatee (Trichechus inunguis). Mammalia 48: 105127.
Elder, W. H., and Rodgers, D. H.. 1968. Age and growth of elephants. A study in the Luangwa Valley, 1965-1967. African Wild Life 22: 281293.
Eisenmann, V. 1980. Les chevaux (Equus sensu lato) fossiles et actuels: crǎnes et dents jugales supérieures. Pp. 1186In Lehman, J. P., ed. Cahiers de Paléontologie. Editions du Centre National de la Recherche Scientifique, Paris.
Eisenmann, V. 1981. Etude des dents jugales inférieures des Equus (Mammalia, Perissodactyla) actuels et fossiles. Palaeovertebrata 10: 127226.
Fortelius, M. 1985. Ungulate cheek teeth: developmental, functional, and evolutionary interrelations. Acta Zoologica Fennica 180: 176.
Gingerich, P. D. 1974. Size variability of the teeth in living mammals and the diagnosis of closely related sympatric fossil species. Journal of Paleontology 48: 895903.
Gingerich, P. D. 1985. Species in the fossil record: concepts, trends, and transitions. Paleobiology 11: 2741.
Gingerich, P. D., and Schoeninger, M. J.. 1979. Patterns of tooth size variability in the dentition of primates. American Journal of Physical Anthropology 51: 457466.
Gingerich, P. D., and Winkler, D. A.. 1979. Patterns of variation and correlation in the dentition of the red fox, Vulpes vulpes. Journal of Mammalogy 60: 691704.
Gould, S. J., and Eldredge, N.. 1977. Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology 3: 115151.
Gould, S. J., and Garwood, R. A.. 1969. Levels of integration in mammalian dentitions: an analysis of correlations in Nesophontes micrus (Insectivora) and Oryzomys couesi (Rodentia). Evolution 23: 276300.
Guenther, E. W. 1955. Mißbildungen an den Backenzähnen diluvialer Elefanten. Meyniana, Kiel 3: 1235.
Guthrie, R. D. 1965. Variability in characters undergoing rapid evolution, an analysis of Microtus molars. Evolution 19: 214233.
Haldane, J.B.S. 1955. The measurement of variation. Evolution 9: 484.
Hooijer, D. A. 1947. On fossil and prehistoric remains of Tapirus from Java, Sumatra and China. Zoologische Mededelingen (Leiden) 27: 253295.
Hooijer, D. A. 1950. The fossil Hippopotamidae of Asia, with notes on the Recent species. Zoologische Verhandelingen (Rijks-museum van Natuurlijke Historie te Leiden) 8: 3124.
Kubiak, H. 1965. Examples of abnormalities in the dentition of fossil elephants. Folia Quaternaria (Kraków) 19: 4561.
Kurtén, B. 1953. On the variation and population dynamics of fossil and Recent mammal populations. Acta Zoologica Fennica 76: 1122.
Kurtén, B. 1964. The evolution of the polar bear, Ursus maritimus Phipps. Acta Zoologica Fennica 108: 126.
Kurtén, B. 1966. Pleistocene bears of North America I. Genus Tremarctos, spectacled bears. Acta Zoological Fennica 115: 3120.
Kurtén, B., and Rausch, R.. 1959. A comparison between Alaskan and Fennoscandian wolverine (Gulo gulo Linnaeus). Acta Arctica 11: 620.
Lande, R. 1977. On comparing coefficients of variation. Systematic Zoology 26: 214217.
Lark, R. M. 1984. A comparison between techniques for estimating the ages of African elephants (Loxodonta africana). African Journal of Ecology 22: 6991.
Laws, R. M. 1966. Age criteria for the African elephant Loxodonta a. africana. East African Wildlife Journal 4: 137.
Lewontin, R. C. 1966. On the measurement of relative variability. Systematic Zoology 15: 141142.
Madden, C. T. 1981. Mammoths of North America. Unpublished Ph.D. Dissertation. University of Colorado, Boulder.
Maglio, V. J. 1971. The nomenclature of intermediate forms: an opinion. Systematic Zoology 20: 370373.
Maglio, V. J. 1973. Origin and evolution of the Elephantidae. Transactions of the American Philosophical Society 63: 1149.
McDonald, J. 1981. North American bison: their classification and evolution. University of California Press, Berkeley.
Miller, R. G. 1966. Simultaneous statistical inference. McGraw-Hill, New York.
Minkoff, E. C. 1983. Evolutionary biology. Addison-Wesley, Reading, Mass.
Mishler, B. D., and Brandon, R. N.. 1987. Individuality, pluralism, and the phylogenetic species concept. Biology and Philosophy 2: 3754.
Mishler, B. D., and Donoghue, M. J.. 1982. Species concepts: a case for pluralism. Systematic Zoology 31: 491503.
Moss, C. J. 1983. Oestrous behaviour and female choice in the African elephant. Behaviour 86: 167196.
Olson, E. C., and Miller, R. L.. 1958. Morphological integration. University of Chicago Press, Chicago.
Osborn, H. F. 1942. Proboscidea. Volume 2. American Museum Press, New York.
Otte, D., and Endler, J. A., eds. 1989. Speciation and its consequences. Sinauer, Sunderland, Mass.
Pengilly, D. 1984. Developmental versus functional explanations for patterns of variability and correlation in the dentitions of foxes. Journal of Mammalogy 65: 3443.
Rees, J. W. 1969. Morphologic variation in the cranium and mandible of the white-tailed deer (Odocoileus virginianus): a comparative study of geographical and four biological distances. Journal of Morphology 128: 95112.
Roth, V. L. 1989. Fabricational noise in elephant dentitions. Paleobiology 15: 165179.
Roth, V. L., and Shoshani, J.. 1988. Dental identification and age determination in Elephas maximus. Journal of Zoology (London) 214: 567588.
Seilacher, A. 1973. Fabricational noise in adaptive morphology. Systematic Zoology 22: 451465.
Sher, A. V., and Garutt, V. E.. 1985. On the method of identification of molars [sic] generations in elephants. In Vereshchagin, N. K. and Kuzmina, I. E. eds. Mammals of Northern Eurasia during Quaternary. Proceedings of the Zoological Institute of the U.S.S.R. Academy of Sciences, Leningrad 131: 93103.
Sikes, S. K. 1967. The African elephant, Loxodonta africana: a field method for the estimation of age. Journal of Zoology (London) 154: 235248.
Simpson, G. G. 1945. Notes on Pleistocene and Recent tapirs. Bulletin of the American Museum of Natural History 86: 3781.
Simpson, G. G. 1953. The major features of evolution. Columbia University Press, New York.
Sokal, R. R., and Braumann, C. A.. 1980. Significance tests for coefficients of variation and variability profiles. Systematic Zoology 29: 5066.
Sokal, R. G., and Rohlf, F. J.. 1981. Biometry. W. H. Freeman, New York.
Stanley, S. M. 1979. Macroevolution: pattern and process. W. H. Freeman, New York.
Van Valen, L. 1962. A study of fluctuating asymmetry. Evolution 16: 125142.
Vrba, E. S. 1970. Evaluation of springbok-like fossils: measurement and statistical treatment of the teeth of the springbok, Antidorcas marsupialis marsupialis Zimmerman (Artiodactyla: Bovidae). Annals of the Transvaal Museum 26: 285299.
Vrba, E. S. 1987. Ecology in relation to speciation rates: some case histories of Miocene-Recent mammal clades. Evolutionary Ecology 1: 283300.
Wallace, J. T. 1968. Analysis of dental variation in wild-caught California house mice. American Midland Naturalist 80: 360380.
Yablokov, A. V. 1974. Variability of mammals. Amerind, New Delhi.
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Paleobiology
  • ISSN: 0094-8373
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