Daughter taxa: (blue => in age window 0-800Ma) | |||||
Paleogene species | |||||
Reticulofenestra bisecta Medium to large (~5-10 µm) with a solid central plug. | |||||
![]() | ![]() | ![]() | Reticulofenestra filewiczii Medium to large; very narrow central opening with weakly birefringent net. | ||
![]() | ![]() | Reticulofenestra stavensis Large to very large (>10 µm) with a solid central plug. | |||
Reticulofenestra magniscutum Large, with thickened, dome-like distal shield; central area filled by a plug. | |||||
Neogene (high latitude) species | |||||
Reticulofenestra perplexa Medium sized (5-8µm) with closed central area | |||||
Reticulofenestra producta Small (<5µm) with closed central area | |||||
Dictyococcites sp. |
Taxonomy:
Distinguishing features: Elliptical reticulofenestrids, central area closed by very robust, conspicuous distal ‘plug’ (birefringent).
Farinacci & Howe catalog pages:
Search data:Tags | LITHS: |
Metrics | Lith size: 3->16µm; |
Geological Range:
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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R. bisecta group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-1-2021
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