Trigonaspis minutissima

Classification: Coccolithophores -> Holococcoliths -> open-tube -> Trigonaspis -> Trigonaspis minutissima
Sister taxa: P. borealis HOL, T. melvillea, T. minutissima, P. garrisonii HOL, T. sp.


Citation: Trigonaspis minutissima Thomsen 1980
Rank: Species

Distinguishing features: Similar to T. diskoensis but smaller (cells 2-3.5µm vs 5-6µm; CFCs 1-1.5µm vs 1.5-2.5µm high). Tower coccoliths only at flagellar pole

Farinacci & Howe catalog pages: T. minutissima *

Size: Cells 2-3.5 µm; CFCs 1.0-1.5 µm high; BCs < 1 µm long.

Biology & life-cycles: Thomsen & Ostergaard (2014) suggst that T. minutissima is likley to be the alternate life-cycle stage of Pappomonas flabellifera, based on biogeographic observations.

See also: Pappomonas flabellifera - possible dipoid phase;

Search data:
TagsLITHS: holococcolith, elliptical, cylindrical, hollow, CA: vacant, process,
CSPH: equant, CFC, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith size: 0.4->0.75µm; Coccosphere size: 2->5µm;
Data source notes: lith size (BC diam) from Thomsen et al. 2015; csph size from illustrated specs
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
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in stage). Data source: [JRY rough estimate]

Plot of occurrence data:


Thomsen, H. A. & Ostergaard, J. B. (2014b). Coccolithophorids in polar waters: Pappomonas spp. revisited. Acta Protozoologica. 53: 235-256. gs V O

Thomsen, H. A. & Ostergaard, J. B. (2015b). Coccolithophorids in Polar Waters: Trigonaspis spp. revisited. Acta Protozoologica. 54: 85-96. gs V O

Thomsen, H. A. (1980d). Two species of Trigonaspis gen. nov. (Prymnesiophyceae) from West Greenland. Phycologia. 19(3): 218-229. gs

Thomsen, H. A. (2016). Baltic Sea coccolithophores – an overview of insights into their taxonomy and ecology from the last 40 years. Journal of Nannoplankton Research. 36(2): 97-119. 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


Trigonaspis minutissima compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-12-2020

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

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