Nannotax3 - ntax_cenozoic - halldalii type Nannotax3 - ntax_cenozoic - halldalii type

halldalii type

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

Daughter taxa (time control age-window is: 0-800Ma)
halldalii type: Monothecate - no XCs. BCs with horizontal flanges and vertical tubes.
Syracosphaera halldalii
BC flange smooth protrusions short or absent
Syracosphaera protrudens
BC flange ridged, with long protrusions into central area


Citation: halldalii type Young et al., 2003
taxonomic 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: Monothecate - no XCs. BCs with horizontal flanges and vertical tubes.

Farinacci & Howe catalog pages:

Search data:
Lith size: 2->3.5µm; Coccosphere size: 7->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 ranges of the species in this database
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" 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


halldalii type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-3-2024

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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