Nannotax3 - ntax_cenozoic - tubeless

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

Syracosphaera HOL (Anthosphaera type)
fried egg shape, dimorphic (CFCs with large leaf-like process)
S. molischii HOL
S. lafourcadii HOL
S. origami HOL
S. periperforata HOL
S. rotaconica HOL
S. marginiporata HOL
S. elevata HOL
S. HOL (Anthosphaera type) sp.

fried egg monomorphic
BCs with flat rim and central protrusion, no marginal perforations, CFCs similar to BCs
A. quattrospina HOL
H. kastriensis
s. aff. quattrospina HOL

flat dimorphic
BCs disks, may have ridge
CFCs with transverse ridge of bridge
S. nana HOL
S. strigilis HOL

flat (coccolithaceae HOLs)
Liths are planar disks, variable ultrastructure. Cocospheres monomorphic. The species were formerly in Crystallolithus
C. leptoporus subsp. leptoporus HOL
C. pelagicus subsp. braarudii HOL
C. pelagicus subsp. pelagicus HOL

flat trapezoidal
liths similar to and associated with Florisphaera
H. sp. cf. F. profunda

tubeless-minute
Lightly calcified holococcoliths, <1µm across; typically organic scales with weak calcification
Balaniger HOL
Calciarcus
Quaternariella HOL

Taxonomy:

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

Distinguishing features:
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcoliths without a tube, flat or cap-shaped

Farinacci & Howe catalog pages: tubeless [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 Gelasian Stage (0% up, 2.6Ma, in Piacenzian 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. gs V O


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tubeless 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=1444 Go to Archive.is to create a permanent copy of this page - citation notes



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