翻訳と辞書 Words near each other ・ Dryocalamus ・ Dryocalamus davisonii ・ Dryocalamus gracilis ・ Dryocalamus nympha ・ Dryocampa ・ Dryocampa rubicunda ・ Dryochlora ・ Dryococelus australis ・ Dryocopus ・ Dryocosmus ・ Dryocosmus kuriphilus ・ Dryoctenes ・ Dryolestes ・ Dryolestida ・ Dryolestidae ・ Dryolestoidea ・ Dryolimnas ・ Dryomyza ・ Dryomyza anilis ・ Dryomyza formosa ・ Dryomyza simplex ・ Dryomyzidae ・ Dryope ・ Dryope (genus) ・ Dryope decrepita ・ Dryope flaveola ・ Dryope melanderi ・ Dryopes ・ Dryophilinae ・ Dryophilus Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Dryolestoidea ： ウィキペディア英語版 Dryolestoidea Dryolestoidea is an extinct clade of Mesozoic mammals that only contains two orders. It has been suggested that this group is closely related to modern therian mammals. ==Characteristics== Dryolestids are mostly represented by teeth, fragmented dentaries and parts of the rostrum. The Jurassic forms retained a coronoid and splenial, but the Cretaceous forms lack these. Another primitive feature is the presence of a Meckelian groove (the Cretaceous forms have a reduced version). Tooth enamel evolved differently in marsupials and eutherians. In a first phase, during the late Triassic and Jurassic, prisms separated from the interprismatic matrix, probably independently in several Mesozoic mammal lineages. More derived enamel types evolved in a second phase, during the Tertiary and Quaternary, but without replacing the old prismatic enamel, instead forming various combinations of three-dimensional structures (called schmelzmuster). Dryolestid dentition is thought to resemble the primitive mammalian dentition before the marsupial-eutherian differentiation and dryolestids are candidates to be the last common ancestor of the two mammalian subclasses. 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「Dryolestoidea」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.