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Xiphodontoidea : ウィキペディア英語版 | Xiphodontidae
Xiphodontidae is an extinct family of even-toed ungulates (order Artiodactyla), endemic to Europe during the Eocene 40.4—33.9 million years ago, existing for about 7.5 million years.〔(PaleoBiology Database: ''Xiphodontidae'', basic info )〕 They were, most likely, all terrestrial herbivores. ''Paraxiphodon'' suggests that they survived into the Lower Oligocene, at least. ==Taxonomy== The Xiphodontidae were named by Flower (1883). It was assigned to Artiodactyla by Cope (1889); to Xiphodontoidea by Hooker (1986); and to Tylopoda by Carroll (1988).〔J. J. Hooker. 1986. Mammals from the Bartonian (middle/late Eocene) of the Hampshire Basin, southern England. Bulletin of the British Museum (Natural History) 39(4):191-478〕〔R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698〕
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