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Stagodontidae is an extinct family of carnivorous metatherian mammals that inhabited North America during the late Cretaceous. Currently, the family includes two genera, ''Eodelphis'' and ''Didelphodon'', which together include some five different species.〔 Other extinct mammals, such as ''Pariadens'', were once considered members of this family, but this is no longer the case. Stagodontids were some of the largest known Cretaceous mammals, ranging from in mass. One of the most unusual features of stagodontids are their robust, bulbous premolars, which are thought to have been used to crush freshwater mollusks. Postcranial remains suggest that stagodontids were most likely semi-aquatic. The most well described forms are found in Laramidia, but they are also present on appalachian sites, further leading credence to their aquatic habits.〔Denton, R. K. Jr., & O’Neill, R. C., 2010, A New Stagodontid Metatherian from the Campanian of New Jersey and its implications for a lack of east-west dispersal routes in the Late Cretaceous of North America. Jour. Vert. Paleo. 30(3) supp.〕 Stagodontids were once thought to be closely related to the Sparassodonta, but later studies suggest they belong to a more ancient branch of the metatherian family tree, possibly closely related to pediomyids. Stagodontids are last known from the Maastrichtian, and are thought to have gone extinct in the K-T Extinction. * Family Stagodontidae〔 * * Genus ''Didelphodon'' * * * ''Didelphodon coyi'' * * * ''Didelphodon padanicus'' * * * ''Didelphodon vorax'' * * Genus ''Eodelphis'' * * * ''Eodelphis browni'' * * * ''Eodelphis cutleri'' == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stagodontidae」の詳細全文を読む スポンサード リンク
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