Nannotax3 - ntax_cenozoic - Syracosphaera strigilis

Citation: Syracosphaera strigilis (Gaarder 1962) Supraha et al. 2018

Basionym: Corisphaera strigilis Gaarder, 1962,

Synonyms:

Syracosphaera sp. I cf. epigrosa of Kleijne (1993);
S. borealis type 2 of Young et al. (2003)
Syracosphaera hirsuta Kleijne & Cros, 2009

Taxonomic discussion: The name of this taxon has been changed from S. hirsuta to S. strigilis following documentation of combination coccospheres by Supraha et al. (2018).

Distinguishing features:
Parent taxon (borealis type): XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.
This taxon: BCs with smooth rim - no real axial structure but irregular ring of isolated node; XCs smooth eliptical discs, with arcuate slits, rare

Like S. borealis except for central area structures - irregular ring of nodes about half way between the rim and axis. Also XCs have prominent arcuate openings at both ends of central area, similar to those in molischii-type XCs.

Temperate water and Mediterranean species

Supraha et al. (2015, 2018) documented a life-cycle association, from multiple observations of combination coccospheres, between a holoccolithophore previously known as Corisphaera strigilis Gaarder 1962 and a heterococcolithophore formerly known as Syracosphaera strigilis Kleijne & Cros 2009

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]

References:

Cerino, F., Malinverno, E., Fornasaro, D., Kralj, M. & Cabrini, M. (2017). Coccolithophore diversity and dynamics at a coastal site in the Gulf of Trieste (northern Adriatic Sea). Estuarine Coastal and Shelf Science. 196: 331-345. gs

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs

Gaarder, K. R. (1962). Electron Microscope Studies on Holococcolithophorids. Nytt Magasin for Botanikk. 10: 35-51. gs O

Heimdal, B. R. & Gaarder, K. R. (1981). Coccolithophorids from the northern part of the eastern central Atlantic II. Heterococcolithophorids. “Meteor” Forschungsergebnisse. 33: 37-69. gs

Kleijne, A. & Cros, L. (2009). Ten new extant species of the coccolithophore Syracosphaera and a revised classification scheme for the genus. Micropaleontology. 55(5): 425-462. gs

Kleijne, A. (1993b). Morphology, Taxonomy and distribution of extant coccolithophorids (Calcareous nannoplankton). PhD Thesis, Vrije Universiteit Amsterdam. 1-321. gs

Supraha, L., Ljubesic, Z. & Henderiks, J. (2015). Combination coccospheres from the Eastern Adriatic Coast. Journal of Nannoplankton Research. 35(S): 81-81. gs

Supraha, L., Ljubesic, Z. & Henderiks, J. (2018). Combination coccospheres from the Eastern Adriatic coast: New, verified and possible life-cycle associations. Marine Micropaleontology. 141: 23-30. gs

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

Syracosphaera strigilis

References:

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