Nannotax3 - ntax_cenozoic - Calyptrosphaera sphaeroidea HET

Calyptrosphaera sphaeroidea HET

Classification: ntax_cenozoic -> Coccolith families inc sed -> narrow rimmed placoliths -> Calyptrosphaera sphaeroidea HET
Sister taxa: C. sphaeroidea HET, Navilithus, Placorhombus, Tetralithoides, Turrilithus


Citation: Calyptrosphaera sphaeroidea Schiller 1913 HET
Rank: Species
Taxonomic discussion: The heterococcolith phase of Calyptrosphaera sphaeroidea has been identified in cultures (Noel et al. 2004). This form does not obviously belong to any previously described genus, whilst the genus Calyptrosphaera is likely a junior synonym of Syracosphaera. As a result, a new genus should probably be described for this form. All details are from Noel et al. (2004).

Distinguishing features:
Parent taxon (narrow rimmed placoliths): Diverse group of coccoliths with narow placolith rims and variable central structures, usually showing four-fold symmetry.
This taxon: Coccoliths elliptical narrow-rimmed placoliths with plate formed from numerous small elements in central area

Farinacci & Howe catalog pages:


Coccospheres non-motile, spherical, ca. 6-10 µm diameter; with ca. 500 coccoliths.
Coccoliths minute (0.5-0.8 µm long), elliptical, narrow-rimmed placoliths. Rim apparently formed of a single cycle of elements with slightly clockwise-oblique sutures. Central area filled by a mass of small angular plates, sometimes slightly convex proximally.


See also: Calyptrosphaera sphaeroidea HOL ;

Search data:
LITHS: placolith, elliptical, CA: ca_disjunct, plate, closed,
CSPH: equant, monomorphic,
Lith size: 0.5->0.8µm; Coccosphere size: 6->10µm; Liths per sphere: 400->600
Data source notes: csph & lith size from OD
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:


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 HET compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-9-2022

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

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