Syracosphaera rotula

Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> rotula type -> Syracosphaera rotula
Sister taxa: S. ampliora, S. rotula


Citation: Syracosphaera rotula Okada & McIntyre, 1977
Rank: Species

Distinguishing features: BCs - flange sutures oblique; XCs large, wheel-like

Farinacci & Howe catalog pages: S. rotula *

BCs - distal flange narrow, with weak sutural ridges showing clockwise obliquity; laths broad, restricted at outer ends forming ring of pseudo-pores; axial structure - weak ridge formed from fusion of lath tips, without upgrowths.
CFCs - not differentiated.
XCs - conical (but usually flattened); rim elements L-shaped forming a proximally-directed wall. Broad lath cycle with sinistral obliquity (i.e. anti-clockwise in distal view). Central plate quadrate, formed of two large elements.

Size: Coccospheres 5-7 µm; BCs 3-3.5 µm; XCs 1-2.5 µm

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, grill,
CSPH: equant, elongated, XC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 1.2->2.4µm; Coccosphere size: 5->6µm; Liths per sphere: 30->50
Data source notes: lith length (BCs) from OD & illustrated specimens; csph data from Cros & Fortuño 2003; lith numbers from Yang & Wei 2003, range of estimates
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: 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]

Plot of occurrence data:


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

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

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

Winter, A., Reiss, Z. & Luz, B. (1979). Distribution of living coccolithophore assemblages in the Gulf of Elat ('Aqaba). Marine Micropaleontology. 4: 197-223. 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, Special Issue. 1: 1-132. gs V O


Syracosphaera rotula compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-8-2021

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