|Daughter taxa (time control age-window is: 0-800Ma)|
Species of Reticulofenestra with the tube extended as a flaring cup-shaped structure.
Medium to large size reticulofenestrid with central opening
Coccoliths small (3-5µm), intergrades with R. pseudoumbilicus.
Coccoliths very small, <3µm. Probably includes several different species.
Coccoliths small 3-5µm, without slits, intergrades with Pseudoemiliania lacunosa.
Coccoliths >6.5µm, sub-circular or broadly elliptical, intergrades with P. lacunosa.
Coccoliths (sub)circular, broad central area (25-50% of coccolith width); NN3-4
Coccoliths circular, with wide central-area, 5-7µm; NN11
Small (3-5µm), (sub)circular, with large central opening (ca 50% of coccolith width)
Distinguishing features: Neogene elliptical reticulofenestrids with an open central area (spanned by delicate proximal net, not visible in lm)
Farinacci & Howe catalog pages:
See also: Reticulofenestra perplexa - name used for forms with closed central area;Search data:
|Metrics||Lith size: 1->12µm;|
Notes: Common in the Mioene and Pliocene. In the Paleogene similar species occur but are conventionally assigned to different species, placed here in the R. umbilicus group. Replaced in the Late Pliocene and Quaternary by Pseudoemiliania, Gephyrocapsa and Emiliania.
Last occurrence (top): in mid part of Ionian Stage (52% up, 0.4Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Ypresian Stage (67% up, 50.5Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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