Nannotax3 - ntax_cenozoic

Clausicoccus

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

Daughter taxa (time control age-window is: 0-800Ma)
				Clausicoccus fenestratus Typical medium sized Clausicoccus species.
				Clausicoccus norrisii Large Clausicoccus (>10µm) with wide shield and bright but indistinctly perforate central area plate.
				Clausicoccus subdistichus Small Clausicoccus with narrow central area typically equal to the rim width.
				Clausicoccus vanheckiae Large Clausicoccus with wide central area typically twice as broad or greater than rim width.
				Clausicoccus sp. Specimens which cannot be assigned to established species

Taxonomy:

Citation: Clausicoccus Prins, 1979

Rank: Genus

Type species: Clausicoccus fenestratus (Deflandre & Fert, 1954) Prins, 1979. [Discolithus]

Synonyms:

Clausibella Aubry in Aubry & Bord 2009 - the type species Ericsonia singularis Perch-Nielsen 171 is very poorly illusrated but appears to be Clausicoccus fenestratus
Pseudoclausicoccus Aubry & Bord 2009 nomen nudum

Taxonomic discussion: This is a common Late Palaeogene genus, many species of which have been described. These were asigned to various genera prior to description of Clausicoccus by Prins (1979). Only the single species C. fenestratus continues into the Miocene but this appears to give rise to Hughesius tasmaniae

Distinguishing features: Rim structure like Coccolithus; perforate plate covers the central area on the distal side

Farinacci & Howe catalog pages: Clausicoccus * , Clausibella *

Morphology: Coccolith rim structure similar to that of Coccolithus, but with a perforate plate covering the central area on the distal side. Centro-distal cycle (bright in XPL) may be narrow or reduced.
The plate typically shows significant birefringence but also appears dark in phase contrast so it may, like the inner tube of Coccolithus, be formed of two layers the upper of R-units and the lower of V-units

Search data:

Tags	LITHS: placolith, elliptical, CA: ca_disjunct, plate, pores, CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 4.5->14µm;

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 Burdigalian Stage (32% up, 19Ma, in Burdigalian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Ypresian Stage (22% up, 54.2Ma, in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Coccolithaceae

References:

Prins, B. (1979). Notes on nannology 1. Clausicoccus, a new genus of fossil Coccolithophorids. INA Newsletter. 1: N2-N4. gs V O

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

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=304 Go to Archive.is to create a permanent copy of this page - citation notes

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