| 翻訳と辞書 |
Banffia
''Banffia'' is a genus of animals described from Middle Cambrian fossils. The genus commemorates Banff, Alberta, near where the first fossil specimens were discovered. Its placement in higher taxa is controversial.
== Anatomy ==
''Banffia constricta'' is known from hundreds of fossils found in the Burgess Shales. It is up to 10 cm in length, and divided equally into anterior and posterior parts. The entire body is twisted in a clockwise spiral, as seen from the front. This is believed to be a secondary adaptation from an initial bilateral condition for a burrowing lifestyle. The anterior section is covered by two carapace-like un-mineralized shells that are fused together. A crown-like structure formed of three concentrate circular features surrounds the mouth. An antenna-form structure just posterior to the mouth may be a sensory organ. The posterior section is composed of 40 to 50 segments. The gut is straight, and the anus is at the terminal tip of the posterior section. The gut appears to have a series of diverticula or pouches. A possible circulatory system is visible in the fossils. ''B. constricta'' and its relative ''Skeemella'' were probably filter or deposit feeders.
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「Banffia」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.
|
|