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Reigitherium
''Reigitherium bunodontum'' is a mammal that lived during the Late Cretaceous (Late Campanian-Maastrichtian). Fossils of it have been found in the Los Alamitos and the La Colonia Formations of Argentina.〔Trevor (2007) (Dinos, Fossils, Children, England, Germany… ) ''Acceso: 31 de octubre de 2007''.〕
Reigitherium was initially classified in the order Dryolestida.〔Bonaparte, J.F. (1990) New Late Cretaceous mammals from the Los Alamitos Formation, northern Patagonia National Geographic Research 6 (1), p.63-93.〕 In 2000 Pascual ''et al.'' found it to be a Docodont. Later authors found it to be neither a Dryolestoid nor a Docodont, and found it to be of uncertain placement within Mammalia.〔Pascual R., Goin F.J., Gonzalez P., Ardolino A. & Puerta P.F. (2000) A highly derived docodont from the Patagonian Late Cretaceous Geodiversitas 22 (3) (Documento pdf ).〕〔Mikko Haaramo (2007) (Mikko's Phylogeny Archive ) ''Acceso: 31 de octubre de 2007''.〕 In 2011, Rougier ''et al.'' found it to be a Dryolestoid again, within Meridiolestida, a clade composed of Gondwanan Dryolestoids.〔 (Supplementary information )〕 It "differs from other Mesozoic mammals including docodontans in that the lower molars decrease in length and notably increase in width posteriorly."〔http://www.dinodata.org/index.php?option=com_content&task=view&id=8080&Itemid=143〕
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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