Nannotax3 - ntax_cenozoic - open-tube


Classification: ntax_cenozoic -> Holococcoliths -> open-tube
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
Chalice-shaped coccoliths. Monomorphic
Calicasphaera bipora
Calicasphaera blokii
Calicasphaera concava
Calicasphaera diconstricta
Calicasphaera sp.

Papposphaera HOL
Tower-like holococcoliths formed from hexagonal crystallite groups.
Papposphaera arctica HOL
Papposphaera polybotrys HOL
Papposphaera sagittifera HOL
Papposphaera sarion HOL
Papposphaera sp. HOL

Holococcoliths formed of triangular crystallite groups (ca. 0.15 µm across), each composed of three (?hexagonal) sub-units.
Dimorphic CFCs tower-like, BCs simple disks.
Pappomonas borealis HOL
Trigonaspis melvillea
Trigonaspis minutissima
Pappomonas garrisonii HOL
Trigonaspis sp.


Citation: Cup-shaped holococcoliths - informal grouping proposed by Young et al., 2003
Rank: informal group of genera

Distinguishing features:
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcoliths with tube, open distally (or cover recessed)

Farinacci & Howe catalog pages: open-tube [no catalog entry yet]



Ecology & Biogeography

Biology & life-cycles

Phylogenetic relations

Search data:
: hollow,
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 range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in "Holocene" 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


open-tube compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-12-2022

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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