Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
not elevated - height < length | |||||
Calyptrosphaera sphaeroidea HOL Tube merges into cover; irregular crystallites | |||||
Syracosphaera pulchra HOL oblonga type Tube merges into cover; hexagonal mesh fabric | |||||
![]() | Syracosphaera pulchra HOL pirus type Tube and cover sharply separated; cover with openings at base | ||||
![]() | Syracosphaera pulchra HOL galea type Tube high and well-separated from cover; hexagonal mesh fabric | ||||
Calyptrolithina divergens Tube sharply separated from cover; cover with perforations | |||||
![]() | ![]() | Calyptrosphaera lluisae Low wall with domal cover, ring of small perforations at base of cover and an apical perforation | |||
elevated - height > length | |||||
![]() | Calyptrosphaera heimdaliae Tube and cover sharply separated; cover elevated with large openings at base and an apical perforation | ||||
![]() | Flosculosphaera Flaring tube-shaped coccoliths with distal cover - flosculoliths. Monomorphic. | ||||
Gliscolithus Bulb-shaped coccoliths with many openings in the bulb - gliscoliths. Monomorphic. | |||||
small forms only known from cultures | |||||
![]() | ![]() | ![]() | ![]() | Calyptrosphaera radiata Liths tubular with large openings near base and closed distal end. Coccosphere vari-monomorphic (coccolith height varies) | |
![]() | ![]() | ![]() | ![]() | Calyptrosphaera sp. strain RCC1181 holococcoliths small (1-1.5 µm) with bulbous protrusion on a flat base, no openings, monomorphic |
Taxonomy:
Distinguishing features:
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcoliths with tube, covered distally by a convex cover
Farinacci & Howe catalog pages: convex [no catalog entry yet]
Search data:
Lith size: 0.9->3.2µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian 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 References:
![]() |
convex compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-7-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=344 Go to Archive.is to create a permanent copy of this page - citation notes |
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