Nannotax3 - ntax_cenozoic

Nannotax3 - ntax_cenozoic - bridged Nannotax3 - ntax_cenozoic - bridged

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
	Corisphaera Weakly dimorphic; BCs with tube spanned by bridge. CFCs with taller bridges	Corisphaera gracilis Corisphaera sp. type B Corisphaera tyrrheniensis Corisphaera sp.
	Helladosphaera Dimorphic; BCs with regular bridge. CFCs with bridge extended into leaf (helladolith)	Helladosphaera cornifera Helladosphaera pienaarii Helladosphaera vavilovii Helladosphaera sp.
	Homozygosphaera Monomorphic; coccoliths with tube spanned by bridge.	Homozygosphaera spinosa Homozygosphaera triarcha Syracosphaera arethusae HOL Homozygosphaera sp.
	Poritectolithus 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)

Taxonomy:

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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Holococcoliths

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. S1: 1-132. gs

bridged compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-10-2024

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=161 Go to Archive.is to create a permanent copy of this page - citation notes

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