|Daughter taxa (time control age-window is: 0-800Ma)|
Medium to large (~5-10 µm) with a solid central plug.
Medium to large; very narrow central opening with weakly birefringent net.
Large to very large (>10 µm) with a solid central plug.
Large, with thickened, dome-like distal shield; central area filled by a plug.
|Neogene (high latitude) species|
Medium sized (5-8µm) with closed central area
Small (<5µm) with closed central area
Distinguishing features: Elliptical reticulofenestrids, central area closed by very robust, conspicuous distal ‘plug’ (birefringent).
Farinacci & Howe catalog pages:Search data:
|Metrics||Lith size: 3->16µm;|
Notes: As defined this group is essentially restricted to the Paleogene.
Last occurrence (top): at top of Early Pleistocene Sub-Epoch (100% up, 0.8Ma, in Calabrian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Lutetian Stage (23% up, 46.3Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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