Nannotax3 - ntax_cenozoic - Coccolith families inc sed

Coccolith families inc sed


Classification: ntax_cenozoic -> Coccolith families inc sed
Sister taxa: Isochrysidales, Coccolithales, Zygodiscales, Syracosphaerales, Coccolith families inc sed, Mesozoic Survivors ⟩⟨ Holococcoliths, Braarudosphaerales, Discoasterales, Nannolith families inc sed, hidden

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Alisphaeraceae
Heterococcoliths asymetric, arranged in meridional rows on coccosphere; V-unit forms flange, R-unit basal. Also nannolith phase "Polycrater" with quadrate aragonitic liths.
Alisphaera
Canistrolithus
Polycrater phase

Papposphaeraceae
Narrow-rimmed muroliths, mostly with prominent central structures.

Umbellosphaeraceae
Placolith-like with distal shield much larger than proximal, predominantly formed from R-units, V-units vestigial.
Umbellosphaera

narrow rimmed placoliths
Diverse group of coccoliths with narow placolith rims and variable central structures, usually showing four-fold symmetry.
C. sphaeroidea HET
Navilithus
Placorhombus
Tetralithoides
Turrilithus

Coccolith genera inc sed
Heterococcolith genera which cannot be assigned to any family

Unidentified heterococcoliths
Specimens which cannot be assigned to established taxa

Taxonomy:

Citation: Coccolith families incertae sedis – informal, sensu Young & Bown 1997
Rank: informal group of families

Distinguishing features:
Parent taxon (ntax_cenozoic): Extant coccolithophores and Cenozoic calcareous nannofossils - Mesozoic nannofossils are in a separate module
This taxon: 2N: Various heterococcolith groups not obviously related to the well-defined orders
N: mostly unknown

Farinacci & Howe catalog pages: Coccolith families inc sed [no catalog entry yet]

Search data:
TagsLITHS:
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Young, J. R. & Bown, P. R. (1997a). Cenozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 36-47. gs V O


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Coccolith families inc sed compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=311 Go to Archive.is to create a permanent copy of this page - citation notes



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