Birkelundia


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

Daughter taxa: (blue => in age window 0-800Ma)
See generic diagnosis

Taxonomy:

Citation: Birkelundia Perch-Nielsen 1971
Rank: Genus
Type species: Birkelundia arenosa Perch-Nielsen 1971
Notes & discussion: Simlar to Clausicoccus but the cntral plate appears optically/crystallographically different

Distinguishing features: Central area covered by perforate plate which appears uniformly dark in xpl

Farinacci & Howe catalog pages: Birkelundia *

Search data:
TagsLITHS: placolith, elliptical, RIM: inner-tube-broad, CA: grill, vacant,
CSPH: spherical, monomorphic, V-UNITS: c-str, distal shield, R-UNITS: ds-tube, prox shield, DETAILS: ca_disjunct, isogyres oblique, rim-unicyclic,
MetricsLith size: 8->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 Bartonian Stage (22% up, 40.4Ma, in Bartonian 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:

References:

Perch-Nielsen, K. (1971b). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter. Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs


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Birkelundia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=77 Go to Archive.is to create a permanent copy of this page - citation notes



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