Nannotax3 - ntax_cenozoic - borealis type

borealis type


Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> borealis type
Sister taxa: borealis type, halldalii type, molischii type, rotula type

Daughter taxa (time control age-window is: 0-800Ma)
borealis type: XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.
Syracosphaera borealis
BCs with smooth rim - axial structure prominent irregular ridge or ring; XCs smooth eliptical discs, rare
Syracosphaera strigilis
BCs with smooth rim - no real axial structure but irregular ring of isolated node; XCs smooth eliptical discs, with arcuate slits, rare
Syracosphaera exigua
BCs with node-ridge ornament; XCs ornamented elliptical discs can cover coccosphere
Syracosphaera pemmadiscus
BCs with narrow, fluted, distal flange; XCs smooth elliptical discs with parenthesis shaped openings
Syracosphaera andruleitii

Taxonomy:

Citation: borealis type Young et al., 2003
Rank: species sub-group

Distinguishing features:
Parent taxon (SY molischii gp): BCs placolith-like (i.e. with proximal and distal flanges), often with ridges and irregular central area calcification, no spines. XCs variable.
This taxon: XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.

Farinacci & Howe catalog pages:

Search data:
TagsLITHS:
MetricsLith size: 1->3µm; Coccosphere size: 6->12µm;
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 Pleistocene Epoch (0.01-2.59Ma, base in Gelasian stage). Data source:

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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borealis type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=144 Go to Archive.is to create a permanent copy of this page - citation notes



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