|Daughter taxa (time control age-window is: 0-800Ma)|
|borealis type: XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.|
BCs with smooth rim - axial structure prominent irregular ridge or ring; XCs smooth eliptical discs, rare
BCs with smooth rim - no real axial structure but irregular ring of isolated node; XCs smooth eliptical discs, with arcuate slits, rare
BCs with narrow, fluted, distal flange; XCs smooth elliptical discs with parenthesis shaped openings
Parent taxon (SY molischii gp): BCs placolith-like (i.e. with proximal and distal flanges), often with ridges and irregular central area calcification, no spines. XCs variable.
This taxon: XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.
Farinacci & Howe catalog pages:
|Lith size: 1->3µm; Coccosphere size: 6->12µm;|
Last occurrence (top): Extant. Data source: Total of range of species in this database
First occurrence (base): within Pleistocene Epoch (0.01-2.59Ma, base in Gelasian stage). Data source:
Plot of occurrence data:
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