Nannotax3 - ntax_cenozoic - bridged 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
Corisphaera gracilis
Corisphaera sp. type B
Corisphaera tyrrheniensis
Corisphaera sp.

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

Monomorphic; coccoliths with tube spanned by bridge.
Homozygosphaera spinosa
Homozygosphaera triarcha
Syracosphaera arethusae HOL
Homozygosphaera sp.

Dimorphic; BCs with bridge formed of sub-parallel strings of crystallites.
CFCs bridge narrower and extended into leaf (helladoliths)
Poritectolithus maximus
Poritectolithus poritectus
Poritectolithus tyronus
Poritectolithus 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
taxonomic 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:
Lith 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 ranges of the species in this database
First occurrence (base): within Pliocene Epoch (2.59-5.33Ma, base in Zanclean stage). Data source: Total of ranges 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. S1: 1-132. gs


bridged compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-4-2024

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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