|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Weakly dimorphic; BCs with tube spanned by bridge.
CFCs with taller bridges
Dimorphic; BCs with regular bridge.
CFCs with bridge extended into leaf (helladolith)
Monomorphic; coccoliths with tube spanned by bridge.
Dimorphic; BCs with bridge formed of sub-parallel strings of crystallites.
CFCs bridge narrower and extended into leaf (helladoliths)
|Syracosphaera anthos HOL|
Monomorphic; coccoliths with tube spanned by narrow bridge extended into leaf (helladoliths)
Taxonomic discussion: Note that very few of these species are well-characterised and that species identification is often problematic.
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcoliths with tube, spanned distally by a bridge
Farinacci & Howe catalog pages: bridged [no catalog entry yet]Search data:
|Metrics||Lith size: 0->0µm;|
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Zanclean Stage (0% up, 5.3Ma, in Zanclean stage). Data source: Total of range of species in this database
Plot of occurrence data:
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