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Callavia
''Callavia'' is an extinct, monotypic genus of trilobite arthropods. ''C. broegeri'' lived during the late Atdabanian stage, which lasted from 530 to 524 million years ago during the early part of the Cambrian Period in what are today Canada and the United States. == Taxonomy == The position of ''Callavia'' in relation to other Olenellina has shifted repeatedly over time. Initially it was assigned to the Holmiinae by Pierre Hupé, and was later moved back and forth to the Callaviinae. Lieberman however, argues ''Callavia'' is a basal member of the Judomioidea.
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「Callavia」の詳細全文を読む
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