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The Ornithorhynchidae are one of the two extant families in the order Monotremata, and contains the platypus and its extinct relatives. The other family is the Tachyglossidae, or echidnas. Within Ornithorhynchidae are two genera, ''Obdurodon'' and ''Ornithorhynchus'': *Family Ornithorhynchidae * *Genus †''Obdurodon'' — an ancient branch of the platypus family * * *†''Obdurodon dicksoni'' * * *†''Obdurodon insignis'' * * *†''Obdurodon/Monotrematum sudamericanum'' * * *†''Obdurodon tharalkooschild'' * *Genus ''Ornithorhynchus'' * * *''Ornithorhynchus anatinus'' (the modern platypus) Another two genera, ''Steropodon'' and ''Teinolophos'', were originally thought to belong to Ornithorhynchidae. However, they were both placed into a new family, Steropodontidae. This decision was made based on differences in the dentary recovered from the Griman Creek Formation, Lightning Ridge, New South Wales, Australia. This dentary is the holotype for the ''Steropodon'' genus, and thus the lack of information is what led to the original misclassification. The extinct ''Ornithorhynchus maximus'' was once included in ''Ornithorhynchus'', but has now been determined to be from the echidna family as ''Zaglossus robustus''. ==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「Ornithorhynchidae」の詳細全文を読む スポンサード リンク
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