Nannotax3 - ntax_cenozoic - bridged


Classification: ntax_cenozoic -> Holococcoliths -> bridged
Sister taxa: tubeless, convex, bridged, flat-topped, septate, open-tube, fossil holococcoliths, U. extant holococcolith

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Weakly dimorphic; BCs with tube spanned by bridge.
CFCs with taller bridges
C. gracilis
C. sp. type B
C. tyrrheniensis
C. sp.

Dimorphic; BCs with regular bridge.
CFCs with bridge extended into leaf (helladolith)
H. cornifera
H. pienaarii
H. vavilovii
H. sp.

Monomorphic; coccoliths with tube spanned by bridge.
H. spinosa
H. triarcha
S. arethusae HOL
H. sp.

Dimorphic; BCs with bridge formed of sub-parallel strings of crystallites.
CFCs bridge narrower and extended into leaf (helladoliths)
P. maximus
P. poritectus
P. tyronus
P. sp.

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


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

Taxonomic discussion:
Note that very few of these species are well-characterised and that species identification is often problematic.

Distinguishing features:
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:
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
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:


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. gs V O


bridged compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2021

Taxon Search:
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Short stable page link: Go to to create a permanent copy of this page - citation notes

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