Nannotax3 - Coccolithophores

Ericsonia

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

Daughter taxa: (blue => in age window 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

Taxonomy:

Citation: Ericsonia Black, 1964

Rank: Genus

Type species: Ericsonia occidentalis Black, 1964

Notes & discussion: The generic name Ericsonia has been used for a wide range of circular and elliptical coccoliths that are now classified within Clausicoccus, Coccolithus, 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:

Tags	LITHS: placolith, circular, RIM: inner-tube-broad, psh-bicyclic, CA: vacant, CSPH: spherical, equant, monomorphic, V-UNITS: distal shield, px-tube, V-prominent, R-UNITS: ds-tube, prox shield, R-prominent, DETAILS: rim-bicyclic, isogyres oblique,
Metrics	Lith size: 5->12µm; Sources:

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:

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:

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 :: view :: open

Ericsonia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-8-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=550 Go to Archive.is to create a permanent copy of this page - citation notes

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