Acanthoica backmanii

Classification: Coccolithophores -> Syracosphaerales -> Rhabdosphaeraceae -> Acanthoica -> Acanthoica backmanii
Sister taxa: A. quattrospina, A. acanthifera, A. acanthos, A. biscayensis, A. janchenii, A. maxima, A. sp A, A. backmanii, A. cohenii, A. laffittei, A. sp.,


Citation: Acanthoica backmanii Dunkley Jones et al., 2009
Rank: Species
Notes & discussion: Body-coccolith morphology is very similar to extant Acanthoica species (e.g., A. quattrospina - A. acanthifera) (Young et al. 2003). May be a junior synonym of Acanthoica cohenii (Jerkovic1971) - as suggested by Galovic & Young (2012), there is a significant difference in age between these species but the morphologies are very similar.

Distinguishing features: Small (2-3µm), broadly elliptical body coccoliths with well-developed rim, radial-lath and lamellar cycles. Lamellar cycle forms very low domed protrusion or elongate spine.

Farinacci & Howe catalog pages: Acanthoica backmanii *

Size: Holotype length 2.4 µm; width 1.8 µm;

See also: Acanthoica cohenii ;

Search data:
TagsLITHS: planolith, elliptical, CA: grill, process, PROCESS: conical, length-slow, low, spine,
CSPH: not known, R-UNITS: c-str, spine, R-prominent, DETAILS: ca_disjunct,
MetricsLith size: 2->3µm;
Sources: lith size from ODs and illustrated specimens (BC width)
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP19-20 zone (34.44-36.97Ma, top in Priabonian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Dunkley Jones et al., 2009

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Acanthoica


    Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs :: view :: open

    Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs :: ::


    Acanthoica backmanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-6-2020

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

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