|Daughter taxa (time control age-window is: 0-800Ma)|
medium sized (ca 5-10µm), central-area with a plug surrounded by ring of pores.
Elliptical with broad central area filled by robust, but coarsely perforated, plate. Perforations visible in LM
Elliptical reticulofenestrid with wide central area spanned by a birefringent central area net. Perforations not visible in lm.
Small with wide central area, net thicker in centre
Large to very large (>10 µm) with wide cenral area, net weakly visible in LM
Very small (<3µm), normally elliptical reticulofenestrid with narrow rim and wide central area spanned by a relatively robust grill.
Boesiger et al 2017 name
marginal ring of perforations
numerous small perforations
Distinguishing features: Elliptical reticulofenestrids with relatively open central area spanned on the proxmal surface by a robust grill (clearly visible in lm as a birefringent plate with variable number of perforations).
Farinacci & Howe catalog pages:Search data:
|Metrics||Lith size: 2->14µm;|
Notes: Common, upper Eocene-upper Oligocene.
Last occurrence (top): in lower part of Burdigalian Stage (32% up, 19Ma, in Burdigalian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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