convex


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

Short diagnosis: Holococcoliths with tube, covered distally by a convex cover


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Liths tubular with large openings near base and closed distal end. Coccosphere vari-monomorphic (coccolith height varies)

Flaring tube-shaped coccoliths with distal cover - flosculoliths. Monomorphic.

Bulb-shaped coccoliths - gliscoliths. Monomorphic.

Tube merges into cover; irregular crystallites

Tube merges into cover; hexagonal mesh fabric

Tube and cover sharply separated; cover with openings at base

Tube and cover sharply separated; cover elevated with openings at base and apex

Tube sharply separated from cover; cover with perforations

Tube high and well-separated from cover; hexagonal mesh fabric

Taxonomy:

Citation: Holococcoliths with convex cover over the tube - informal grouping proposed by Young et al., 2003
Rank: informal grouping

Farinacci & Howe catalog pages:

Short diagnosis: Holococcoliths with tube, covered distally by a convex cover

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Gelasian Stage (1.81-2.59Ma, base in Gelasian 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 - convex by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-5-2017

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