R. reticulata group
Classification: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. reticulata group
Sister taxa: C. floridanus group, R. bisecta group, R. lockeri group, R. parvula group, R. pseudoumbilicus group, R. reticulata group, R. umbilicus group, R. sp.,
Citation: R. reticulata groupRank: species groupNotes & discussion: Broadly, but not completely, correlates with the general usage of the genus Cribrocentrum Perch-Nielsen, 1971. This group includes the only strictly circular Paleogene reticulofenestrids but some smaller forms may have imperceptible (or lost) nets and there is some evidence of transitional subcircularity.
Distinguishing features: Typically circular reticulofenestrids with relatively narrow circular central area with robust grill (clearly visible in lm).
Farinacci & Howe catalog pages:
The morphological data given here can be used on the advanced search page. See also these notes
|Tags||LITHS: sub-circular, |
CSPH: spherical, V-UNITS: none, R-UNITS: all, c-str, distal shield, prox shield, tube, DETAILS: isogyres kinked, isogyres oblique,
|Metrics||Lith size: 5->16µm; |
Notes: As defined this group is essentially restricted to the middle-upper Eocene.
Last occurrence (top): near top of Priabonian Stage (86% up, 34.4Ma, in Priabonian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Ypresian Stage (28% up, 53.7Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Reticulofenestra
Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs :: view :: open