open-tube


Ancestry: Coccolithophores -> Holococcoliths -> open-tube
Sister taxa: tubeless, convex, bridged, flat-topped, septate, open-tube, fossil holococcoliths,

Short diagnosis: Holococcoliths with tube, open distally (or cover recessed)


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Chalice-shaped coccoliths. Monomorphic

Tower-like holococcoliths formed from hexagonal crystallite groups.

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.

Taxonomy:

Citation: Cup-shpaed holococcoliths - informal grouping proposed by Young et al., 2003
Rank: informal grouping

Farinacci & Howe catalog pages:

Short diagnosis: Holococcoliths with tube, open distally (or cover recessed)

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in stage). Data source: Total of range of species in this database

Plot of occurrence data:

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, Special Issue, 1: 1-132.


Nannotax3 - Coccolithophores - open-tube by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-3-2017

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