Classification: Coccolithophores -> Holococcoliths -> tubeless -> tubeless-minute -> Calciarcus
Sister taxa: Balaniger HOL, Calciarcus, Quaternariella HOL

Daughter taxa: (blue => in age window 0-800Ma)
Calciarcus alaskensis
Scales ca. 0.5 µm across, with 4 calcified struts.
Calciarcus sp.

Wigwamma annulifera HOL
Similar to C. alaskensis but with 3 struts


Citation: Calciarcus Manton, Sutherland & Oates 1977
Rank: Genus
Type species: Calciarcus alaskensis Manton, Sutherland & Oates 1977
Taxonomic discussion: See Thomsen & Ostergaard (2014) for a recent review

Distinguishing features: Monomorphic. Rhombohedral crystallites forming 3 or 4 radial converging struts attached to a scale with calcareous rim

Farinacci & Howe catalog pages: Calciarcus + *

Search data:
TagsLITHS: holococcolith, circular, CA: diagonal cross,
CSPH: equant, monomorphic,
MetricsLith size: 0.5->0.7µm; Coccosphere size: 5->7µm;
Data source notes: lith and 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: Total of range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in stage). Data source: Total of range of species in this database

Plot of occurrence data:


Manton, I., Sutherland, J. & Oates, K. (1977). Arctic coccolithophorids: Wigwamma arctica gen. et sp. nov. from Greenland and Arctic Canada; W. annulifera sp. nov. from South Africa and S. Alaska and Calciarcus alaskensis gen. et sp. nov. from S. Alaska. Proceedings of the Royal Society of London. 197(1127): 145-168. gs

Thomsen, H. A. & Ostergaard, J. B. (2014a). Coccolithophorids in polar waters: Calciarcus spp. revisited. Acta Protozoologica. 53(145-157): -. gs V O


Calciarcus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-10-2020

Taxon Search:
Advanced Search

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

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics