Deltatheridia, a new order of mammals. Bulletin of the AMNH ; v. 132, article 1

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dc.contributor.author Van Valen, Leigh M. en_US
dc.date.accessioned 2005-10-06T14:56:16Z
dc.date.available 2005-10-06T14:56:16Z
dc.date.issued 1966 en_US
dc.identifier.uri http://hdl.handle.net/2246/1126
dc.description 126 p., 8 p. of plates : ill. ; 27 cm. en_US
dc.description Includes bibliographical references (p. 113-123) and index. en_US
dc.description.abstract "A reconsideration of the phylogeny of some early placental mammals, especially the creodonts, has resulted in the removal of all creodonts except the Miacidae from the Carnivora. The Arctocyonidae and their descendants, the Mesonychidae, are placed in the Condylarthra, and a new order, the Deltatheridia, is created for the Oxyaenoidea, the Palaeoryctidae, the Didymoconidae, and Micropternodus. The zalambdodont insectivores may or may not also be referable to the Deltatheridia. A survey of taxonomically significant characters indicates that the Miacidae are apparently closer to the Arctocyonidae than to the Pantolestinae or to the Deltatheridia. The whales were probably derived from mesonychids in the Paleocene. A detailed consideration of the morphology, systematics, and evolution of the Didelphodontinae is presented, and observations are made on many other mammalian genera, mainly, but not exclusively, of the Deltatheridia. Greatest emphasis is placed on the evolution of dental structure and occlusion, and cranial circulation. A detailed terminology is proposed for the structures of primitive therian teeth. Teeth of possible Tiffanian and Puercan oxyaenoid ancestors are described. Apterodon is tentatively referred to the Mesonychidae; Micropternodus, Nyssodon, and Sarcodon are referred to the Palaeoryctidae; Kochictis and Kopidodon, to the Mioclaeninae; Argillotherium is referred to the Oxyaeninae; and Praolestes, Opisthopsalis, Hyracolestes, and Xenacodon are referred to the Erinaceoidea. New genera are Avunculus in the Didelphodontinae, Pararyctes in the Palaeoryctinae, Mongoloryctes in the Didymoconidae, and Epapheliscus in the Apheliscinae. A new species of Palaeoryctes is described from the late Paleocene, one of Oxyaena, from the early Eocene; and one of Oxyaenodon, from the late Eocene. A possible case of geographic speciation in Didelphodus is presented, and comments are made on determining the relative adaptiveness of different characters, conditions of competitive exclusion, criteria of taxonomic definitions, and other theoretical matters"--P. 112. en_US
dc.format.extent 47230440 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York : [American Museum of Natural History] en_US
dc.relation.ispartofseries Bulletin of the American Museum of Natural History ; v. 132, article 1 en_US
dc.subject.lcc QH1 .A4 vol.132, art.1, 1966 en_US
dc.subject.lcsh Deltatheridia. en_US
dc.subject.lcsh Insectivora, Fossil. en_US
dc.subject.lcsh Mammals -- Phylogeny. en_US
dc.subject.lcsh Mammals -- Evolution. en_US
dc.title Deltatheridia, a new order of mammals. Bulletin of the AMNH ; v. 132, article 1 en_US
dc.type text en_US

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  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

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