Ericsonia subpertusa


Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Ericsonia -> Ericsonia subpertusa
Sister taxa: E. monilis, E. subpertusa, E. media ⟩⟨ E. orbis, E. staerkeri, E. aliquanta, E. robusta, E. sp.
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Taxonomy:

Citation: Ericsonia subpertusa Hay & Mohler, 1967
Rank: Species
Synonyms: Cycloplacolithella kavaryi Haq (1968) [my identification - JRY 2015]

Distinguishing features: medium to large, subcircular to circular with narrow central area

Farinacci & Howe catalog pages: E. subpertusa * , C. kavaryi *


Morphology: Typical E. pertusa is circular with in distal viaew a rather mall central opening, a very broad tube cycle and narrow distal shield cycle. The morphlogy develops during the Palaeocene and early forms (in NP4-5) are smaller and have broader distal shield cycles. E. robusta is a more extreme developemnt of the morphoogy with very narrow distal shield cycle.

Search data:
TagsLITHS: placolith, circular, CA: vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 4->9µm;
Data source notes: lith size from Romein 1979 + images here
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP9 zone (55.86-57.21Ma, top in Ypresian stage). Data source: [PRB rough estimate]
First occurrence (base): in lower part of NP3 zone (40% up, 64.2Ma, in Danian stage). Data source: Varol, 1989, fig. 12.4

Plot of occurrence data: