Nannotax3 - ntax_cenozoic - Coccolith genera inc sed Nannotax3 - ntax_cenozoic - Coccolith genera inc sed

Coccolith genera inc sed

Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed
Sister taxa: Alisphaeraceae, Papposphaeraceae, Umbellosphaeraceae, narrow rimmed placoliths, Coccolith genera inc sed, U. heterococcoliths

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Placolith with strongly distal shield, showing high birefringence
Aliculosphaera subantarctica

Circular to stellate placoliths contructed from 6-12, large, radial elements. Often give the appearance of stellate nannoliths with low birefringence in LM.
Biantholithus sparsus
Biantholithus astralis
Biantholithus hughesii
Biantholithus flosculus
Biantholithus sp.

Small, inconspicuous 3-tiered placoliths with central area spanned by diagonal cross bars.
Camuralithus pelliculatus
Camuralithus sp.

Small oblong placolith coccoliths with the rim apparently formed from a single cycle of elements. Addtional elements are present in the central area of C. simplex but absent from it (possibly due to preservation) in C. scissurata. Numerous coccoliths per coccosphere.
Centumgemina scissurata
Centumgemina simplex
Hornibrookina apellanizii


Craterolithus eolutetiensis
Craterolithus hirsutus
Craterolithus hoerstgensis
Craterolithus plenilutetiensis

Elliptical to oblong placoliths with shields formed from numerous narrow elements and central areas spanned by plates that may be perforate.
Ellipsolithus anadoluensis
Ellipsolithus aubryae
Ellipsolithus bollii
Ellipsolithus distichus
Ellipsolithus lajollaensis
Ellipsolithus macellus
Ellipsolithus pumex
Ellipsolithus sp.

Dimorphic - BCs tube-like; AACs simple plates, typically formed of two elements.
Gladiolithus flabellatus
Gladiolithus striatus
Gladiolithus adeyi
Gladiolithus brevis
Gladiolithus contus
Gladiolithus ornatus
Gladiolithus sp.

Placolith-like coccoliths, with distal shield reduced to ring of spines.
Ilselithina fusa
Ilselithina iris
Ilselithina sp.

Relatively tall nannofossils that flare from a small basal disc to form a trumpet shape. They have a narrow, axial canal and are usually seen in side view.
Leesella procera
Leesella sp.


Typically circular planolith coccoliths with broad, flat shield and rim elements joined along inclined sutures. Shield is dark in XPL but a narrow, brighter tube cycle may be present.
Pedinocyclus gibbsiae
Pedinocyclus larvalis
Geminilithella okayi
Pedinocyclus sp.

Medum-sized, narrow-rimmed placolith surmounted by domal protrusion with hexagonal pores
Petasus faviformis


Citation: Cocccolith genera incertae sedis
taxonomic rank: informal group of genera

Distinguishing features:
Parent taxon (Coccolith families inc sed): 2N: Various heterococcolith groups not obviously related to the well-defined orders
N: mostly unknown

This taxon: Heterococcolith genera which cannot be assigned to any family

Farinacci & Howe catalog pages: Coccolith genera 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 genera inc sed compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-7-2024

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

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