|Daughter taxa (time control age-window is: 0-800Ma)|
|halldalii type: Monothecate - no XCs. BCs with horizontal flanges and vertical tubes.|
BC flange smooth protrusions short or absent
BC flange ridged, with long protrusions into central area
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: Monothecate - no XCs. BCs with horizontal flanges and vertical tubes.
Farinacci & Howe catalog pages:Search data:
|Metrics||Lith size: 2->3.5µm; Coccosphere size: 7->12µm;|
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in "Holocene" stage). Data source: Total of range of species in this database
Plot of occurrence data:
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