Research Library | Digital Repository

Intercontinental migration of Neogene amphicyonids (Mammalia, Carnivora) : appearance of the Eurasian beardog Ysengrinia in North America. American Museum novitates ; no. 3384

Show simple item record Hunt, Robert M., Jr., 1941- en_US 2005-10-06T16:41:19Z 2005-10-06T16:41:19Z 2002 en_US
dc.description 53 p. : ill., map ; 26 cm. en_US
dc.description Includes bibliographical references (p. 49-52). en_US
dc.description.abstract At the beginning of the Neogene a remarkable faunal turnover occurred within the North American carnivore community. The dominant larger Oligocene carnivores (creodonts, nimravid cats, the amphicyonid Daphoenus) became extinct during the late Oligocene and were replaced in the early Miocene by amphicyonine amphicyonids and hemicyonine ursids that entered North America from Eurasia. During a five million-year interval from ~23 to 18 Ma, large amphicyonines appear in late Arikareean and early Hemingfordian faunas of the North American midcontinent. Although most fossils are from western Nebraska and southeastern Wyoming, occurrences of amphicyonines at several sites in the eastern United States (Delaware, Florida) indicate that they rapidly established a broad geographic distribution in North America during the early Miocene. This report describes and summarizes the North American specimens of the rare immigrant amphicyonine Ysengrinia, the first large amphicyonine to enter the New World. Ysengrinia exists in North America from ~23 to 19 Ma, becoming extinct at the end of the late Arikareean. A single species of Ysengrinia is recognized in North America: Y. Americana (Wortman, 1901), comb. nov., restricted to the late Arikareean of western Nebraska and southeastern Wyoming. The North American hypodigm includes the only known complete skull of the genus, associated with a mandible and partial postcranial skeleton. Because most Eurasian occurrences of Ysengrinia are limited to mandibles or isolated teeth of single individuals, intraspecific variation in teeth and skeleton in these carnivores has been difficult to determine. The more complete North American specimens provide estimates of dental and osteological variation in Ysengrinia, and suggest that the North American species is dimorphic. Skeletal remains of early Miocene New World Ysengrinia are most often found in riparian and waterhole environments. en_US
dc.format.extent 2660751 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. 3384 en_US
dc.subject.lcc QL1 .A436 no.3384, 2002 en_US
dc.subject.lcsh Ysengrinia. en_US
dc.subject.lcsh Amphicyonidae -- Dispersal -- North America. en_US
dc.subject.lcsh Mammals, Fossil -- Nebraska. en_US
dc.subject.lcsh Mammals, Fossil -- Wyoming. en_US
dc.subject.lcsh Paleontology -- Neogene -- Nebraska. en_US
dc.subject.lcsh Paleontology -- Neogene -- Wyoming. en_US
dc.subject.lcsh Paleontology -- Nebraska. en_US
dc.subject.lcsh Paleontology -- Wyoming. en_US
dc.title Intercontinental migration of Neogene amphicyonids (Mammalia, Carnivora) : appearance of the Eurasian beardog Ysengrinia in North America. American Museum novitates ; no. 3384 en_US
dc.title.alternative Neogene amphicyonid Ysengrinia en_US
dc.type text en_US

Files in this item

This item appears in the following Collection(s)

  • 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.

Show simple item record

Search Entire Repository

Advanced Search


My Account