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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cassianellidae ： ウィキペディア英語版 Cassianellidae Cassianellidae is a small extinct family of prehistoric bivalves which lived from the Middle Triassic, Ladinian stage through the Late Triassic Norian stage.〔(The Paleobiology Database Cassianellidae entry ) accessed 2 January 2012〕 It has been suggested that the family may have evolved from the related family Bakevelliidae. Bakevelliidae species are found in North America, South America, Europe, the Middle East, and Asia. Living a stationary life attached to substrate in marine and brackish envoronments, they formed shells of an aragonite composition with a low amount of magnesium calcite. The family Cassianellidae was named by K. Ichikawa in 1958.〔 ==Description== The cassianellids are noted for being restricted to the Triassic only, going extinct during the end Triassic extinction event. They are thought to have a close relationship to the longer lived family Bakevelliidae and it is possible the cassianellids may have even evolved from one of the early Triassic bakevelliid genera.〔 As is found in the Bakevelliidae genus ''Kobayashites'' and the Isognomonidae genus ''Lithiotis'', cassianellids are distinguished by the presence of a larval septum which is retained in the adult shell morphology.〔 Also notable for the entire family is the presence of a primitive alivincular type ligament, termed an alivincular-areate ligament. This form of ligament was widely found in many of the Triassic bivalve families but evolution of more refined ligament systems resulted in the shift away form the alivincular-areate system. Only a few modern families, such as Gryphaeidae, still retain the alivincular-areate ligament system. Several of the genera, such as ''Cassianella'', have a widespread distribution.〔 In contrast, ''Lilangina'' is known only from Asia, and ''Septihoernesia'' from the middle Triassic of northern Italy.〔 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「Cassianellidae」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.