Classification: Coccolithophores -> Syracosphaerales -> Rhabdosphaeraceae -> Rhabdosphaera
Sister taxa: Acanthoica, Algirosphaera, Blackites, Cyrtosphaera, Discosphaera, Palusphaera, Pseudotriquetrorhabdulus, Rhabdosphaera, Solisphaera,

Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Spine with pentameral structure

Rhabdoliths with a thin, narrow coccolith base and a narrow spine with an axial canal.

 Similar to Discosphaera tubifera but with domal rather than open flaring end.

Rhabdoliths with a very narrow styliform spine and four buttress-like structures at the base of the spine, which appear as a collar in LM.

Long delicate spines with collar near base

Specimens which cannot be assigned to established species


Citation: Rhabdosphaera Haeckel, 1894
Rank: Genus
Type species: Rhabdosphaera claviger Murray & Blackman 1898, subsequent designation by Hay and Towe, 1962
Variants: Palusphaera -similar to Rhabdosphaera but monomorphic, all coccoliths have spines. In the fossil record these would be included in Rhabdosphaera
Synonyms: Rhabdolithus Kamptner ex Deflandre in Grassé 1952.
Aspidorhabdus Hay & Towe 1962

Distinguishing features: Coccoliths without radial lath cycle; coccospheres dimorphic, only some spine-bearing

Farinacci & Howe catalog pages: Rhabdosphaera * , Rhabdolithus * , Aspidorhabdus * , Clavosphaera *

Morphology remarks: Coccosphere: Dimorphic with inner spine-bearing and outer non spine-bearing coccoliths, distributed around coccosphere. Usually non-motile and no differentiation of circum-flagella coccoliths but occasional cells with flagella have been observed (Lohmann 1902, Probert pers. comm.).
Coccoliths: Radial cycle absent, lamellar cycle fills central area and forms spine.

Search data:
TagsLITHS: planolith, elliptical, sub-circular, CA: process, PROCESS: length-slow, parallel-sided, spine, tall,
CSPH: spherical, equant, BC+process, BC-dimorphic, polymorphic, R-UNITS: spine, R-prominent, DETAILS: ca_disjunct,
MetricsLith size: 3->12µm; Coccosphere size: 8->35µm;
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: Total of range of species in this database
First occurrence (base): in upper part of Ypresian Stage (84% up, 49.1Ma, in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Deflandre, G. (1952). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In, Grassé, P. P. (ed.) Traite de Zoologie. Masson, Paris 439-470. gs

Haeckel, E. (1894). Systematische Phylogenie der Protisten und Pflanzen. Reimer, Berlin. -. gs


Rhabdosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-3-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1192 Go to Archive.is to create a permanent copy of this page - citation notes

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