Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
borealis type XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated. | |||||
halldalii type Monothecate - no XCs. BCs with horizontal flanges and vertical tubes. | |||||
molischii type XCs “undulating” planoliths, confined to imbricate circlet around flagellar pole. CFCs with spines showing calyx with 4-fold symmetry, AACs usually present. | Syracosphaera molischii Syracosphaera hastata Syracosphaera marginiporata Syracosphaera ossa Syracosphaera epigrosa | ||||
rotula type XCs wheel-like, with radial laths well-separated, spoke-like. BCs and XCs both show distinct chirality. CFCs not differentiated. |
Taxonomy:
Distinguishing features:
Parent taxon (Syracosphaera): Coccospheres usually dithecate. Exothecal coccoliths (XCs) highly variable. Endothecal coccoliths are muroliths with 1, 2 or 3 flanges, the forms with 2 flanges are often placolith-like.
This taxon: BCs placolith-like (i.e. with proximal and distal flanges), often with ridges and irregular central area calcification, no spines. XCs variable.
Farinacci & Howe catalog pages:
Search data:
Lith size: 1->3.5µm; Coccosphere size: 3->13µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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. S1: 1-132. gs References:
SY molischii gp compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1331 Go to Archive.is to create a permanent copy of this page - citation notes |
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