Calyptrosphaera radiata

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


Citation: Calyptrosphaera radiata Sym & Kawachi 2000
Rank: species

Distinguishing features: Liths tubular with large openings near base and closed distal end. Coccosphere vari-monomorphic (coccolith height varies)

Farinacci & Howe catalog pages: C. radiata [no catalog entry yet]

Morphology: 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.

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

Search data:
TagsLITHS: holococcolith, elliptical, cylindrical, hollow, CA: process,
CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith 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:


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: 8-3-2021

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

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