tubeless


Classification: Coccolithophores -> Holococcoliths -> tubeless
Sister taxa: tubeless, convex, bridged, flat-topped, septate, open-tube, fossil holococcoliths,

Short diagnosis: Holococcoliths without a tube, flat or cap-shaped


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
fried egg shape, dimorphic (CFCs with large leaf-like process)



Liths are planar disks, variable ultrastructure. Cocospheres monomorphic. The species were formerly in Crystallolithus

BCs disks, may have ridge
CFCs with transverse ridge of bridge

BCs with flat rim and central protrusion, no marginal perforations, CFCs similar to BCs

Lightly calcified holococcolihs, <1µm across; typically organic scales with weak calcification

Taxonomy:

Citation: Holococcoliths without tube - informal grouping proposed by Young et al., 2003
Rank: informal grouping

Farinacci & Howe catalog pages: tubeless [no catalog entry yet]

Short diagnosis: Holococcoliths without a tube, flat or cap-shaped

Search data:
TagsLITHS: holococcolith, H: disk-like, H: septate,
MetricsLith size: 0->0┬Ám;
Sources:
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): within Gelasian Stage (1.81-2.59Ma, base in Gelasian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Young, J.R.; Geisen, M.; Cros, L.; Kleijne, A.; Probert, I. & Ostergaard, J.B., (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue, 1: 1-132.


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tubeless compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-11-2017

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Go to Archive.is to create a permanent copy of this page - citation notes



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