Calyptrosphaera sphaeroidea HOL

Classification: ntax_cenozoic -> Holococcoliths -> convex -> Calyptrosphaera sphaeroidea HOL
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 sphaeroidea Schiller, 1913 HOL
Rank: Species

Distinguishing features: Tube merges into cover; irregular crystallites

Farinacci & Howe catalog pages: C. sphaeroidea * , C. sphaeroidea minor *

Morphology: Lith shape similar to S. pulchra HOL oblonga type but less regular; irregular wall fabric, crystallites rather larger than in most holococcoliths and with rough surface; CFCs not differentiated.

Cultures: strains of this species are maintained in culture, for details see Roscoff culture collection.

Biology & life-cycles: Noël et al. (2004) have shown from culture experiments that the alternate life-cycle phase of this species produces narrow-rimmed placoliths (see Calyptrosphaera sphaeroidea HET). They suggestd that the hetrococcolith phase was neritic and the holococcolith phase pelagic. Since the type species of Calyptrosphaera, C. oblonga, is known to be a life-cycle stage of Syracosphaera pulchra a new genus should be described for this species. Cytology described by Klaveness (1973), including evidence of a "skin" occurring beyond the holcoccoliths.

See also: Calyptrosphaera sphaeroidea HET ;

Search data:
TagsLITHS: holococcolith, elliptical, hollow, CA: closed,
CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith size: 0.9->1.5µm; Coccosphere size: 5->12µm; Liths per sphere: 50->180
Data source notes: morphom data from Cros & Fortuño (2002)
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:

Plot of occurrence data:


Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs V O

Klaveness, D. (1973). The microanatomy of Calyptrosphaera sphaeroidea, with some supplementary observations on the motile stage of Coccolithus pelagicus. Norwegian Journal of Botany. 20: 151-162. gs

Noël, M. -H., Kawachi, M. & Inouye, I. (2004). Induced dimorphic life cycle of a coccolithophorid, Calyptrosphaera sphaeroidea. Journal of Phycology. 40(1): 112-129. gs

Schiller, J. (1913). Vorläufige Ergebnisse der Phytoplankton-Untersuchungen auf den Fahrten S.M.S. Najade in der Adria 1911/12. I. Die Coccolitophoriden. Sitzungberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Klasse. 122(1): 597-617. gs V O

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. gs V O


Calyptrosphaera sphaeroidea HOL compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-3-2021

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