Nannotax3 - ntax_main - Syracosphaera mediterranea HOL marisrubri type Nannotax3 - ntax_main - Syracosphaera mediterranea HOL marisrubri type

Syracosphaera mediterranea HOL marisrubri type


Classification: ntax_main -> Holococcoliths -> flat-topped -> S. mediterranea HOL type -> Syracosphaera mediterranea HOL marisrubri type
Sister taxa: C. multipora, S. histrica HOL, S. mediterranea HOL gracillima type, S. mediterranea HOL hellenica type, S. mediterranea HOL marisrubri type, S. mediterranea HOL wettsteinii type

Taxonomy:

Citation: Syracosphaera mediterranea HOL marisrubri type Keuter et al. 2021
Taxonomic rank: species

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:

The coccospheres are spheres of 13 to 18μm length. The holococcoliths of this variant are about 2 to 2.6 μm long, consisting of an open tube with an indented wall open distally and subdivided by vertical septae. These septae define 6 to 10 pores, frequently including one or two central pores. The septae are higher in the center of the coccolith, giving the distal surface a domal shape, but there is no central boss. Possible CFCs were detected in a single complete coccosphere, with a more elevated central area than the other coccoliths (Fig. 7e, f). [Keuter et al. 2021]

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:
BCs 2-2.6 µm


Biology & life-cycles

Forms combination coccospheres with Syracosphaera mediterranea HET; three good combination coccospheres observed by Keuter et al. 2021, all from the Gulf of Aqaba, Red Sea.

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)
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:
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source:

Plot of occurrence data:

References:

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


nannotaxlogo400px

Syracosphaera mediterranea HOL marisrubri type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-7-2025

Taxon Search:
Advanced Search

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



Add Comment

* Required information
Captcha Image

Comments

No comments yet. Be the first!