Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Ericsonia
Sister taxa: Coccolithus, Bramletteius, Campylosphaera, Chiasmolithus, Coronocyclus, Cruciplacolithus, Ericsonia, Solidopons ⟩⟨ Birkelundia, Clausicoccus, Craticullithus, Hughesius, Kilwalithus

Daughter taxa (time control age-window is: 0-800Ma)
Forms with narrow central opening
Ericsonia monilis
very small (~3μm), circular with raised distal collar and tall proximal shield
Ericsonia subpertusa
medium to large, subcircular to circular with narrow central area
Ericsonia media
medium to large (~6–11μm), subcircular to circular; moderately broad upper-tube cycle and narrow central area;
Forms with wide central opening
Ericsonia orbis
small (<5μm), circular with relatively wide central area;
Ericsonia staerkeri
small (<5μm), circular with relatively wide central area spanned by cross bars
Ericsonia aliquanta
medium-sized (5–9μm), circular to subcircular with relatively wide central area
Ericsonia robusta
large (>9μm), circular with wide central area;
Ericsonia sp.
Specimens which cannot be assigned to any established species


Citation: Ericsonia Black, 1964
Rank: Genus
Type species: Ericsonia occidentalis Black, 1964
Taxonomic discussion: The generic name Ericsonia has been used for a wide range of circular and elliptical coccoliths that are now classified within ClausicoccusCoccolithus, Prinsius, Toweius and Reticulofenestra. The type species, E. occidentalis, is a large, broadly-elliptical, middle Eocene form which is probably a junior synonym of C. pelagicus. Nonetheless the set of taxa included here are normally placed in Ericsonia. So, this usage is followed here pending a revison of the taxonomy. 
The genus Diadelithus Aubry & Bord (2009) probably should be used instead, since the type species is E. robusta. However, as described Diadelithus includes a rather different set of species and so the genus would need to be emended, and new combinations proposed [JRY 2016]

Distinguishing features: Coccolithus-like coccoliths that are typically circular and have broad upper tube elements that dominate the distal shield. The dominance of the R-unit cycle results in a bright LM XPL image that is distinct from Coccolithus.

Farinacci & Howe catalog pages: Ericsonia + * , Diadelithus *

Search data:
TagsLITHS: placolith, circular, CA: vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->12µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in lower part of Rupelian Stage (17% up, 32.9Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Danian Stage (42% up, 64.2Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Aubry, M. -P. & Bord, D. (2009). Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In, Koeberl, C. & Montanari, A. (eds) The Late Eocene Earth—Hothouse, Icehouse, and Impacts. Geological Society of America, Special Papers. 452: 279-301. gs

Black, M. (1964). Cretaceous and Tertiary coccoliths from Atlantic seamounts. Palaeontology. 7: 306-316. gs V O


Ericsonia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-2-2021

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