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
C. bipora
C. blokii
C. concava
C. diconstricta
C. sp.

Papposphaera HOL
Tower-like holococcoliths formed from hexagonal crystallite groups.
P. arctica HOL
P. polybotrys HOL
P. sagittifera HOL
P. sarion HOL
P. 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.
P. borealis HOL
T. melvillea
T. minutissima
P. garrisonii HOL
T. 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]



Search data:
TagsLITHS: hollow,
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 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: 7-7-2022

Taxon Search:
Advanced Search

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

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics