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| MavicaNet - классический дизайн |
Lagenida | |
 | Каталог / Природа / Жизнь / Протоктисты (Protoctistae) / Одноклеточные эукариоты (Protista) / Фораминифера (Foraminifera) / Lagenida |
 | Glandulinidae [7] |
| Polymorphinidae [4] | ||
| Nodosariidae [6] |
| Vaginulinidae [4] |
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ORIGIN AND EARLY EVOLUTIONARY HISTORY OF THE ORDER LAGENIDA (CLASS FORAMINIFERA)
The order Lagenida is a monophyletic group of calcareous foraminifers that originated in Middle Pennsylvanian time via acquisition of hyaline-radial wall structure and loss of microgranular wall structure, the latter being characteristic of the close sister group and likely ancestor, the Fusulinida. Early lagenides are delineated hierarchically into subgroups on the basis of presence or absence of partitioning within their tests, and among partitioned forms, on continuous versus discontinuous growth styles. [eng] |
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