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Evolution of early Eocene Palaeosinopa (Mammalia, Pantolestidae) in the Willwood Formation of the Bighorn Basin, Wyoming

Published online by Cambridge University Press:  03 November 2015

Rachel H. Dunn  and
Kenneth D. Rose
Rachel H. Dunn
Affiliation:
Department of Anatomy, Des Moines University, 3200 Grand Ave, Des Moines, Iowa50312, USA 〈rdunn@dmu.edu〉
Kenneth D. Rose
Affiliation:
Center for Functional Anatomy and Evolution, Johns Hopkins University, 1830 E. Monument Street, Baltimore Maryland 21205, USA 〈kdrose@jhmi.edu〉
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Abstract

Species-level diversity and evolution of Palaeosinopa from the Willwood Formation of the Bighorn Basin is reassessed based on substantial new material from the Bighorn, Powder River, and Wind River basins. We recognize three species of Palaeosinopa in the Willwood Formation of the Bighorn Basin: P. lutreola, P. incerta, and P. veterrima. The late Wasatchian species P. didelphoides is not present in the Bighorn Basin. The Willwood species can be differentiated based only on size. P. veterrima is the most common and wide-ranging species and is the most variable in size and morphology: the stratigraphically lowest individuals are smaller, with narrower, more crestiform lower molars; whereas the highest are larger, with wider, more bunodont teeth. Although it could be argued that these represent distinct species, we demonstrate that this morphological evolution occurred as the gradual and mosaic accumulation of features, suggesting in situ anagenetic evolution. The two smaller species are present only low in the section (biochrons Wa0–Wa4) and show no discernable evolution in size or morphology. A new skeleton of Palaeosinopa veterrima from the Willwood Formation is described, and other new postcrania are reported. The skeleton is the oldest associated skeleton of Palaeosinopa known, yet it is remarkably similar to those of younger, more derived pantolestids, the primary disparities being minor differences in proportions of the innominate, femur, and tibia, and co-ossification of the distal tibia and fibula. Either P. incerta or P. lutreola was likely the ancestral population that gave rise to the other Wasatchian Palaeosinopa. Alternatively, P. veterrima may have migrated into the Bighorn Basin from the Powder River Basin.

Type
Articles
Information
Journal of Paleontology , Volume 89 , Issue 4 , July 2015 , pp. 665 - 694
Copyright
Copyright © 2015, The Paleontological Society 

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References

Argot, C., 2002, Functional-adaptive analysis of the hindlimb anatomy of extant marsupials and the paleobiology of the Paleocene marsupials Mayulestes ferox and Pucadelphys andinus: Journal of Morphology, v. 253, p. 76–108.CrossRefGoogle ScholarPubMed
Beard, K.C., and Dawson, M.R., 2009, Early Wasatchian mammals of the Red Hot Local Fauna, uppermost Tuscahoma Formation, Lauderdale County, Mississippi: Annals of the Carnegie Museum of Natural History, v. 78, p. 193–243.CrossRefGoogle Scholar
Bloch, J.I., Secord, R., and Gingerich, P.D., 2004, Systematics and phylogeny of late Paleocene and early Eocene Palaeoryctinae (Mammalia, Insectivora) from the Clarks Fork and Bighorn basins, Wyoming: University of Michigan Contributions From the Museum of Paleontology, v. 31, p. 119–154.Google Scholar
Bown, T.M., and Schankler, D.M., 1982, A Review of the Proteutheria and Insectivora of the Willwood Formation (Lower Eocene), Bighorn Basin, Wyoming: Geological Survey Bulletin, v. 1523, p. 1–79.Google Scholar
Bown, T.M., and Kraus, M.J., 1993, Time-stratigraphic reconstruction and integration of paleopedologic, sedimentologic, and biotic events (Willwood Formation, lower Eocene, northwest Wyoming, U.S.A.): Palaios, v. 8, p. 68–80.CrossRefGoogle Scholar
Bown, T.M., Rose, K.D., Simons, E.L., and Wing, S.L., 1994a, Distribution and stratigraphic correlation of upper Paleocene and lower Eocene fossil mammal and plant localities of the Fort Union, Willwood, and Tatman formations, southern Bighorn Basin, Wyoming: U. S. Geological Survey Professional Paper, v. 1540, p. 1–103.Google Scholar
Bown, T.M., Holroyd, P.A., and Rose, K.D., 1994b, Mammal extinctions, body size, and paleotemperature: Proceedings of the National Academy of Sciences of the United States of America, v. 91, p. 10403–10406.CrossRefGoogle ScholarPubMed
Carroll, R.L., 1988, Vertebrate Paleontology and Evolution: New York, W.H. Freeman and Co., 472 pp.Google Scholar
Chew, A.E., 2005, Biostratigraphy, paleoecology and synchronized evolution in the early Eocene mammalian fauna of the central Bighorn Basin, Wyoming: Baltimore, MD, Johns Hopkins University, 661 pp.Google Scholar
Chew, A.E., 2009, Paleoecology of the early Eocene Willwood mammal fauna from the central Bighorn Basin, Wyoming: Paleobiology, v. 35, p. 13.CrossRefGoogle Scholar
Clyde, W.C., 1997. Stratigraphy and mammalian paleontology of the McCullough Peaks, northern Bighorn Basin, Wyoming: implications for biochronology, basin development, and community reorganization across the Paleocene-Eocene boundary: Ann Arbor, MI, University of Michigan, 271 pp.Google Scholar
Clyde, W.C., Hamzi, W., Finarelli, J.A., Wing, S.L., Schankler, D., and Chew, A., 2007, Basin-wide magnetostratigraphic framework for the Bighorn Basin, Wyoming: Geological Society of America Bulletin, v. 119, p. 848–859.CrossRefGoogle Scholar
Cope, E.D., 1872, Second account of new Vertebrata from the Bridger Eocene: Proceedings of the American Philosophical Society, v. 12, p. 466–468.Google Scholar
Cope, E.D., 1873, Annual report of the US Geological Survey of the Territories for 1872: Bulletin of the United States Geological and Geographic Survey of the Territories, v. 4, p. 546–607.Google Scholar
Cope, E.D., 1881, On the vertebrata of the Wind River Eocene beds of Wyoming: Bulletin of the United States Geological and Geographic Survey of the Territories, v. 6, p. 132–202.Google Scholar
Cope, E.D., 1884, The Vertebrata of the Tertiary Formations of the West: Report of the United States Geological Survey of the West, v. 3, p. 1–1009.Google Scholar
Davis, D.D., 1964, The giant panda: a morphological study of evolutionary mechanisms, Fieldiana: Zoology, v. 3, p. 1–339.Google Scholar
Delson, E., 1971, Fossil mammals of the early Wasatchian Powder River local fauna, Eocene of northeast Wyoming: Bulletin of the American Museum of Natural History, v. 146, p. 305–364.Google Scholar
Dunn, R.H., and Rasmussen, D.T., 2007, Skeletal morphology and locomotor behavior of Pseudotomus eugenei (Rodentia, Paramyinae) from the Uinta Formation, Utah: Journal of Vertebrate Paleontology, v. 27, p. 987–1006.CrossRefGoogle Scholar
Gazin, C.L., 1962, A further study of the lower Eocene mammalian faunas of southwestern Wyoming: Smithsonian Miscellaneous Collections, v. 144, p. 1–98.Google Scholar
Gingerich, P.D., 1974a, Size variability of the teeth in living mammals and the diagnosis of closely related sympatric fossil species: Journal of Paleontology, v. 48, p. 895–903.Google Scholar
Gingerich, P.D., 1974b, Stratigraphic record of Early Eocene Hyopsodus and the geometry of mammalian phylogeny: Nature, v. 248, p. 107–109.CrossRefGoogle Scholar
Gingerich, P.D., 1980, Evolutionary patterns in early Cenozoic mammals: Annual Review of Earth and Planetary Sciences, v. 8, p. 407–424.CrossRefGoogle Scholar
Gingerich, P.D., 2003, Land-to-sea transition in early whales: evolution of Eocene Archaeoceti (Cetacea) in relation to skeletal proportions and locomotion of living semiaquatic mammals: Paleobiology, v. 29, p. 429–454.2.0.CO;2>CrossRefGoogle Scholar
Gingerich, P.D., and Schoeninger, M.J., 1979, Patterns of tooth size variability in the dentition of primates: American Journal of Physical Anthropology, v. 51, p. 457–465.CrossRefGoogle ScholarPubMed
Gunnell, G.F., and Gingerich, P.D., 1991, Systematics and evolution of late Paleocene and early Eocene Oxyaenidae (Mammalia, Creodonta) in the Clarks Fork Basin, Wyoming: University of Michigan Contributions From the Museum of Paleontology, v. 28, p. 141–180.Google Scholar
Gunnell, G.F., Bown, T.M., Bloch, J.I., and Boyer, D.M., 2008, Proteutheria, in Janis, C.M., Gunnell, G.F., and Uhen, M.D., eds., Evolution of Tertiary Mammals of North America: vol. 2, Small Mammals, Xenarthrans, and Marine Mammals: Cambridge, Cambridge University Press, p. 63–81.CrossRefGoogle Scholar
Guthrie, D.A., 1971, The mammalian fauna of the Lost Cabin Member, Wind River Formation (lower Eocene) of Wyoming: Annals of the Carnegie Museum, v. 43, p. 47–113.CrossRefGoogle Scholar
Hooker, J.J., 2013, Origin and evolution of the Pseudorhyncocyonidae, a European Paleogene family of insectivorous placental mammals. Palaeontology, v. 56, p. 807–835.CrossRefGoogle Scholar
Janis, C.M., Gunnell, G.F., and Uhen, M.D., 2008, Evolution of Tertiary Mammals of North America, vol. 2: small mammals, xenarthrans, and marine mammals: New York, Cambridge University Press, 795 p.CrossRefGoogle Scholar
Kalthoff, D.C., Rose, K.D., and von Koenigswald, W., 2011, Dental microstructure in Palaeanodon and Tubulodon (Palaeanodonta) and bioerosional tunneling as a widespread phenomenon in fossil mammal teeth: Journal of Vertebrate Paleontology, v. 31, p. 1303–1313.CrossRefGoogle Scholar
Koenigswald, von, W., 1980, Das Skelett eines Pantolestiden (Proteutheria, Mamm.) aus dem mittleren Eozän von Messel bei Darmstadt: Paläontologische Zeitschrift, v. 56, p. 267–287.CrossRefGoogle Scholar
Koenigswald, von, W., 1987, Ein sweites Skelett von Buxolestes (Pantolestidae, Proteutheria, Mammalia) aus dem mittleozän von Messel bei Darmstadt: Carolinea, v. 45, p. 36–42.Google Scholar
Kükenthal, W., 1891, On the adaptation of mammals to aquatic life: The Annals and Magazine of Natural History, v. 7, p. 153–179.CrossRefGoogle Scholar
MacLeod, N., and Rose, K.D., 1993, Inferring locomotor behavior in Paleogene mammals via eigenshape analysis: American Journal of Science, v. 293, p. 300–355.CrossRefGoogle Scholar
Marsh, O.C., 1872, Preliminary description of new Tertiary mammals: American Journal of Science and Arts, p. 202–224.CrossRefGoogle Scholar
Matthew, W.D., 1899, A provisional classification of the fresh-water Tertiary of the West: Bulletin of the American Museum of Natural History, v. 12, p. 19–75.Google Scholar
Matthew, W.D., 1901, Additional observations on the Creodonta: Bulletin of the American Museum of Natural History, v. 14, p. 1–38.Google Scholar
Matthew, W.D., 1909, Carnivora and Insectivora of the Bridger Basin, middle Eocene: Memoirs of the American Museum of Natural History, v. 9, p. 293–576.Google Scholar
Matthew, W.D., and Granger, W., 1918, A revision of the lower Eocene Wasatch and Wind River faunas Part V—Insectivora (Continued), Glires, Edentata. Bulletin of the American Museum of Natural History, v. 38, p. 565–657.Google Scholar
McKenna, M.C., 1960, Fossil Mammalia from the early Wasatchian Four Mile fauna, Eocene of northwest Colorado. University of California Publication in Geological Sciences, v. 37, p. 1–130.Google Scholar
McKenna, M.C., 1975, Toward a phylogenetic classification of the Mammalia, in Luckett, W.P., and Szalay, F.S., eds., Phylogeny of the Primates: New York, Plenum Publishing Co., p. 21–46.CrossRefGoogle Scholar
McKenna, M.C., and Bell, S.K., 1997, Classification of Mammals Above the Species Level: New York, Columbia University Press, 631. p.Google Scholar
Pfretzschner, H.U., 1993, Muscle reconstruction and aquatic locomotion in the middle Eocene Buxolestes piscator from Messel near Darmstadt. Kaupia, v. 3, p. 75–87.Google Scholar
Pfretzschner, H.U., 1999, Buxolestes minor n. sp. - ein neuer Pantolestide (Mammalia, Proteutheria) aus der eozänen Messel-Formation: Courier Forschungsinstitut Senckenberg, v. 216, p. 19–29.Google Scholar
Plavcan, J.M., and Cope, D.A., 2001, Metric variation and species recognition in the fossil record: Evolutionary Anthropology, v. 10, p. 204–222.CrossRefGoogle Scholar
R Core Team, 2013, R: A language and environment for statistical computing: GNUGeneralPublicLicense.Google Scholar
Robinson, P., Gunnell, G.F., Walsh, S.L., Clyde, W.C., Storer, StuckyJ.E., R.K. J.E., R.K., Froehlich, D.J., Ferrusquia-Villafranca, I., and McKenna, M.C., 2004, Wasatchian through Duchesnean biochronology, in Woodburne, M.O., ed., Late Cretaceous and Cenozoic Mammals of North America: Biostratigraphy and Geochronology: New York, Columbia University Press, p. 106–155.CrossRefGoogle Scholar
Romer, A.S., 1966, Vertebrate Paleontology: Chicago, IL, University of Chicago Press, 468 p.Google Scholar
Rose, K.D., 1981, The Clarkforkian Land-Mammal Age and mammalian faunal composition across the Paleocene-Eocene boundary: University of Michigan Papers on Paleontology, v. 26, p. 1–197.Google Scholar
Rose, K.D., 1990, Postcranial skeletal remains and adaptations in early Eocene mammals from the Willwood Formation, Bighorn Basin, Wyoming: Geological Society of America Special Paper, v. 243, p. 107–133.CrossRefGoogle Scholar
Rose, K.D., 2006, The Beginning of the Age of Mammals: Baltimore, Johns Hopkins University Press, 428 p.CrossRefGoogle Scholar
Rose, K.D., Chew, A.E., Dunn, R.H., Kraus, M.J., Fricke, H.C., and Zack, S.P., 2012, Earliest Eocene mammalian fauna From the Paleocene-Eocene Thermal Maximum at Sand Creek Divide, southern Bighorn Basin, Wyoming: University of Michigan Papers on Paleontology, v. 36, p. 1–122.Google Scholar
Rose, K.D., and Lucas, S.G., 2000, An Early Paleocene palaeanodont (Mammalia, Pholidota) from New Mexico, and the origin of Palaeanodonta: Journal of Vertebrate Paleontology, v. 20, p. 139–156.CrossRefGoogle Scholar
Rose, K.D., and von Koenigswald, W., 2005, An exceptionally complete skeleton of Palaeosinopa (Mammalia, Cimolesta, Pantolestidae) from the Green River Formation, and other postcranial elements of the Pantolestidae from the Eocene of Wyoming (USA): Palaeontographica Abteilung A, v. 273, p. 55–96.CrossRefGoogle Scholar
Rose, K.D., Dunn, R.H., and Grande, L., 2014, A new pantolestid skeleton from the early Eocene Green River Formation, and skeletal ontogeny in Pantolestidae (Mammalia: Pantolesta). Journal of Vertebrate Paleontology, v. 34, p. 932–940.CrossRefGoogle Scholar
Schankler, D.M., 1980, Faunal zonation of the Willwood Formation in the central Bighorn Basin, Wyoming: University of Michigan Papers on Paleontology, v. 24, p. 99–114.Google Scholar
Simpson, G.G., 1945, The principles of classification and a classification of mammals: Bulletin of the American Museum of Natural History, v. 85, p. 1–350.Google Scholar
Simpson, G.G., Roe, A., and Lewontin, R.C., 1960, Quantitative Zoology: New York, Harcourt, Brace and World, Inc, 440 p.Google Scholar
Smith, R.J., 1997, Palaeosinopa russelli (Mammalia, Pantolesta), une espèce nouvelle du Membre de Dormaal, proche de la limite Paléocène–Éocène: Bulletin De L’Institut Royal Des Sciences Naturelle De Belgique (Sciences De La Terre), v. 67, p. 153–159.Google Scholar
Szalay, F.S., 1977, Phylogenetic relationships and a classification of the eutherian Mammalia, in Hecht, M.K., Goody, P.C., and Hecht, B.M., eds., New York, Major Patterns in Vertebrate Evolution. Plenum Publishing Co, p. 315–374.CrossRefGoogle Scholar
Winge, H., 1941, The Interrelationships of the Mammalian Genera, vol. I: Monotremata, Marsupialia, Insectivora, Cheiroptera, Edentata, Copenhagen, C.A., Reitzels Forlag, 418 p.Google Scholar
Zack, S.P., 2009, The phylogeny of eutherian mammals: a new analysis emphasizing dental and postcranial morphology in Paleogene taxa: Baltimore, MD, Johns Hopkins University, 628 p.Google Scholar