Nannotax3 - ntax_cenozoic - Coccolith families inc sed 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
Heterococcoliths asymetric, arranged in meridional rows on coccosphere; V-unit forms flange, R-unit basal. Also nannolith phase "Polycrater" with quadrate aragonitic liths.
Polycrater phase

Narrow-rimmed muroliths, mostly with prominent central structures.

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

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

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

Unidentified heterococcoliths
Specimens which cannot be assigned to established taxa


Citation: Coccolith families incertae sedis – informal, sensu Young & Bown 1997
taxonomic 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:
Lith 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 ranges of the species in this database
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:


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


Coccolith families inc sed compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-12-2023

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!