bridged


Ancestry: Coccolithophores -> Holococcoliths -> bridged
Sister taxa: tubeless, convex, bridged, flat-topped, septate, open-tube, fossil holococcoliths,

Short diagnosis: Holococcoliths with tube, spanned distally by a bridge


Daughter taxa (blue => in age window 0-300Ma) 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)

Monomorphic; coccoliths with tube spanned by narrow bridge extended into leaf (helladoliths)

Taxonomy:

Citation: Holococcoliths with bridge over the tube - informal grouping proposed by Young et al., 2003
Rank: informal grouping

Farinacci & Howe catalog pages:

Short diagnosis: Holococcoliths with tube, spanned distally by a bridge

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Zanclean Stage (3.60-5.33Ma, base in Zanclean stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Young, J.R.; Geisen, M.; Cros, L.; Kleijne, A.; Probert, I. & Ostergaard, J.B., (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue, 1: 1-132.


Nannotax3 - Coccolithophores - bridged by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-6-2017

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