tubeless
Classification: ntax_cenozoic -> Holococcoliths -> tubeless
Sister taxa: tubeless, convex, bridged, flat-topped, septate, open-tube, fossil holococcoliths, U. extant holococcolith
Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa |
 |  |  |  | Sphaerocalyptra
dimorphic BCs conical, may have large openings, CFCs higher
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 |  |  |  | Anthosphaera
fried egg shape, dimorphic (CFCs with large leaf-like process)
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 |  |  |  | fried egg monomorphic
BCs with flat rim and central protrusion, no marginal perforations, CFCs similar to BCs
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 |  |  |  | flat dimorphic
BCs disks, may have ridge
CFCs with transverse ridge of bridge
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 |  |  |  | flat (coccolithaceae HOLs)
Liths are planar disks, variable ultrastructure. Cocospheres monomorphic. The species were formerly in Crystallolithus
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 |  | | | flat trapezoidal
liths similar to and associated with Florisphaera
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 |  |  |  | tubeless-minute
Lightly calcified holococcoliths, <1µm across; typically organic scales with weak calcification
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Taxonomy:
Citation: Holococcoliths without tube - informal grouping proposed by Young et al., 2003Rank: informal group of genera
Distinguishing features: Holococcoliths without a tube, flat or cap-shaped
Farinacci & Howe catalog pages: tubeless [no catalog entry yet]
Search data:
| Tags | LITHS: |
| Metrics | 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 range of species in this database
First occurrence (base): at base of Gelasian Stage (0% up, 2.6Ma, in Gelasian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Holococcoliths
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. gs V O
/Calcidiscus leptoporus subsp. leptoporus HOL/JRYSEM-280-19p.JPG)
/Coccolithus pelagicus subsp. pelagicus HOL/Young_etal_2003_122-20.JPG)
/Calcidiscus leptoporus subsp. leptoporus HOL/Young_etal_2003_174-12.JPG)
/Calcidiscus leptoporus subsp. leptoporus HOL/Young_etal_2003_bl08-rigidus.JPG)
