Nannotax3 - ntax_cenozoic - open-tube 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. 2 (Turrisphaera phase)
Papposphaera sp. 3 (Turrisphaera phase)
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
taxonomic 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]

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 ranges of the species in this database
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" 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


open-tube compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-5-2024

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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