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''Chuandianella ovata'' is an extinct shrimp-like stem group crustacean that lived during the Atdabanian Age of the Early Cambrian (about 520 to 516 million years ago). It is the only species classified under the genus ''Chuandianella'' of the family Waptiidae. Its fossils were recovered from the Chengjiang ''Lagerstätte'' of the Maotianshan Shales in China.〔(【引用サイトリンク】title=''Chuandianella'' )〕 It was originally described in 1975 under the "ostracod"-like genus ''Mononotella'', as ''Mononotella ovata''. In 1991, the paleontologists Xian-Guang Hou and Jan Bergström reclassified it under the new genus ''Chuandianella'' when additional discoveries of more complete specimens made its resemblance to ''Waptia fieldensis'' more apparent. Like ''W. fieldensis'', ''Chuandianella ovata'' had a bivalved carapace with a median ridge, a pair of caudal rami, a single pair of antennae, and stalked eyes. In 2004, paleontologist Jun-Yuan Chen tentatively transferred it to the genus ''Waptia''. However, ''C. ovata'' had eight abdominal somites in contrast to five in ''W. fieldensis''. Its limbs were biramous and were undifferentiated, unlike those of ''W. fieldensis''. Other authors deemed these differences to be enough to separate it from ''Waptia'' to its own genus. ==See also== *''Waptia'' *List of Chengjiang Biota species by phylum *Burgess Shale *Burgess shale type preservation 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「Chuandianella」の詳細全文を読む スポンサード リンク
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