Taxonomy:
Distinguishing features:
Parent taxon (S. mediterranea HOL type): Dimorphic - usually cavate
BCs with flat distal cover with or without openings; central boss
CFCs; with irregular bridge or distal cover arched upwards
This taxon: BCs open tubes with internal septae defining 6-10 pores. CFCs more elevated.
Farinacci & Howe catalog pages: Syracosphaera mediterranea HOL marisrubri type
Morphology:
Thee holococcoliths are very similar in SEM to the septate holococcolths produced by Calcidiscus and Scyphosphaera. However, in this form the septae are birefringent in plan view. Also in SEM side view the spetae bulge above the wall.
Size:
Biology & life-cycles
See also: Calcidiscus leptoporus subsp. quadriperforatus HOL - very similar form, but with fewer pores.;
Search data:Lith size: 2->2.6µm; Coccosphere size: 12->20µm; Liths per sphere: 80->120 Data source notes: Keuter et al. 2021 (liths per sphere based on my counts) |
Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source:
Plot of occurrence data:
Keuter, S., Young, J. R., Koplovitz, G., Zingone, A. & Frada, M. J. (2021). Novel heterococcolithophores, holococcolithophores and life cycle combinations from the families Syracosphaeraceae and Papposphaeraceae and the genus Florisphaera. Journal of Micropalaeontology. 40: 75-99. gs O 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:
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Syracosphaera mediterranea HOL marisrubri type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-7-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1690 Go to Archive.is to create a permanent copy of this page - citation notes |
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