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Involutinida : ウィキペディア英語版 | Involutinida
Involutinida is an order of Foraminifera found in the fossil record from the early Permian to early Late Cretaceous (Cenomanian) in which the proloculus, the initial chamber, is followed by an enrolled tubular second chamber. The test wall is calcareous, perforate, radiate, originally aragonitic but commonly recrystallized to homogeneous microgranular structure, with lamellar thickenings or pillar-like structures in umbilical region of one or both sides.〔Alfred R. Loeblich Jr & Helen Tappan,1988. Forminiferal Genera and their Classification. Van Nostrand Reinhold.〕 ==Taxonomy== Four families are included in Involutinida,〔 three of which, the Involutinidae, Hirsutospirellidae, and Planispirillinidae all have undivided tubular second chambers. The fourth, the Ventrolaminidae has numerous chambers following the proloculus. All four are represented by planispiral or trochospiral forms.
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「Involutinida」の詳細全文を読む
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