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New amphicyonid carnivorans (Mammalia, Daphoeninae) from the early Miocene of southeastern Wyoming. American Museum novitates ; no. 3385

Show simple item record Hunt, Robert M., Jr., 1941- en_US 2005-10-06T16:41:21Z 2005-10-06T16:41:21Z 2002 en_US
dc.description 41 p. : ill., map ; 26 cm. en_US
dc.description Includes bibliographical references (p. 40-41). en_US
dc.description.abstract Latest Arikareean sediments of the upper Arikaree Group in southeastern Wyoming produced rare fossils of large, early Miocene amphicyonid carnivorans for field parties of the Frick Laboratory, American Museum, from 1932 to 1940. Recent geologic field investigations, including mapping, have discovered additional remains of these carnivorans, clarifying their geographic and stratigraphic distribution, and permitting a more informed description of the earlier collections. These carnivorans come from tuffaceous sandstones of the Upper Harrison beds, the terminal formation-rank unit of the Arikaree Group in southeastern Wyoming. A large species of the amphicyonid Daphoenodon (D. falkenbachi, n. sp.) occurs in northern Goshen and southeastern Platte Counties, Wyoming, and in the Niobrara Canyon, Sioux County, Nebraska. A smaller species of this genus (D. skinneri, n. sp.), probably ancestral to D. falkenbachi, is known from a single individual from southern Niobrara County, Wyoming. A third amphicyonid, Adilophontes brachykolos, n. gen., n. sp., is closely related to Daphoenodon, and is reported from northern Goshen County and east-central Platte County, Wyoming. The three species share a similar basicranial anatomy, including the form of the auditory bulla, and can be referred to the endemic North American amphicyonid subfamily Daphoeninae. They are found only in Upper Harrison strata in southeastern Wyoming and northwest Nebraska, and are presently unknown elsewhere in North America. Postcranial remains indicate that these large predators lacked the extreme digitigrade specializations of the feet and limbs encountered in living canids and large felids. They are characterized by relatively short lower-limb segments, and paraxonic feet with slightly spreading digits, which might be termed subdigitigrade. These skeletal traits and their carnassiform dentitions with prominent canines, premolars, and shearing carnassials indicate a carnivorous diet probably obtained by a rapid rush from cover and a short, powerful pursuit of ungulate prey in open grassland and riparian stream settings east of the Rocky Mountain uplifts. A new formal term, Anderson Ranch Formation, is proposed as a replacement for the Upper Harrison beds of Peterson (1909) that yielded the carnivores discussed in this study. en_US
dc.format.extent 3046562 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3385 en_US
dc.subject.lcc QL1 .A436 no.3385 2002 en_US
dc.subject.lcsh Daphoenodon falkenbachi. en_US
dc.subject.lcsh Daphoenodon skinneri. en_US
dc.subject.lcsh Adilophontes brachykolos. en_US
dc.subject.lcsh Amphicyonidae -- Wyoming. en_US
dc.subject.lcsh Amphicyonidae -- Nebraska. en_US
dc.subject.lcsh Mammals, Fossil -- Wyoming. en_US
dc.subject.lcsh Mammals, Fossil -- Nebraska. en_US
dc.subject.lcsh Paleontology -- Miocene -- Wyoming. en_US
dc.subject.lcsh Paleontology -- Miocene -- Nebraska. en_US
dc.subject.lcsh Paleontology -- Wyoming. en_US
dc.subject.lcsh Paleontology -- Nebraska. en_US
dc.subject.lcsh American Museum of Natural History. -- Frick Collection. en_US
dc.subject.lcsh Formations (Geology) -- Great Plains. en_US
dc.subject.lcsh Geology, Stratigraphic -- Miocene -- Great Plains -- Nomenclature. en_US
dc.title New amphicyonid carnivorans (Mammalia, Daphoeninae) from the early Miocene of southeastern Wyoming. American Museum novitates ; no. 3385 en_US
dc.title.alternative Early Miocene amphicyonids en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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