Nannotax3 - ntax_cenozoic - Calyptrosphaera radiata Nannotax3 - ntax_cenozoic - Calyptrosphaera radiata

Calyptrosphaera radiata

Classification: ntax_cenozoic -> Holococcoliths -> convex -> Calyptrosphaera radiata
Sister taxa: C. sphaeroidea HOL, S. pulchra HOL oblonga type, S. pulchra HOL pirus type, S. pulchra HOL galea type, C. divergens ⟩⟨ C. heimdaliae, C. lluisae, C. radiata, Flosculosphaera, Gliscolithus


Citation: Calyptrosphaera radiata Sym & Kawachi 2000
Rank: species

Distinguishing features:
Parent taxon (convex): Holococcoliths with tube, covered distally by a convex cover
This taxon: Liths tubular with large openings near base and closed distal end. Coccosphere vari-monomorphic (coccolith height varies)

Farinacci & Howe catalog pages: C. radiata *


The species is only known from cultures and the coccoliths are not well-formed. The shape is somewhat similar to Turrisphaera but the cells have prominent chloroplasts and lack a haptonema, whilst the Papposphaeraceae cells have prominent haptonemata but lack chloroplasts (Thomsen et al. 1995). Molecular genetic data suggest affinity with the Coccolithaceae and with Calyptrosphaera sphaeroidea.

Coccoliths up to 2µm long but height varies on coccosphere, about 0.8 µm wide

Search data:
LITHS: holococcolith, elliptical, cylindrical, hollow, CA: process,
CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, R-prominent,
Lith size: 1->2µm; Coccosphere size: 5->7µm;
Data source notes: lith size (height) from illustrated specimens; csph size from illustrated specimens;
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: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]

Plot of occurrence data:


Jordan, R. W., Cros, L. & Young, J. R. (2004). A revised classification scheme for living Haptophytes. Micropaleontology. 50(supplement 1): 55-79. gs

Sym, S. & Kawachi, M. (2000). Ultrastructure of Calyptrosphaera radiata, sp. nov. (Prymnesiophyceae, Haptophyta). European Journal of Phycology. 35: 283-293. gs V O


Calyptrosphaera radiata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-4-2023

Taxon Search:
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AphiaID: 670396 Nomenclatural data on WoRMS
Short stables page link: Go to to create a permanent copy of this page - citation notes

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