Syracosphaera ampliora

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


Citation: Syracosphaera ampliora Okada & McIntyre, 1977
Rank: Species
Synonyms: Syracosphaera aff. ossa
Taxonomic discussion: NB This species is similar to S. ossa (and was illustrated as S. aff. ossa by Borsetti & Cati 1972, and Gaarder & Heimdal 1977) but BCs have narrower rim with prominent sutures, and their size and shape is less variable, also XCs wheel-like rather than undulating.

Distinguishing features: BCs - flange sutures kninked, XCs elliptical, spoked

Farinacci & Howe catalog pages: S. ampliora *

Morphology: BCs - rim smooth, sutures slightly elevated, kinked showing distinct anticlockwise obliquity in outer part; radial laths often with median bulge, which may produce double cycle of perforations; axial structure - prominent rounded mound formed by fusion of laths.
CFCs - not differentiated.
XCs - usually absent, but two specimens of ours show single XCs; smaller than BCs, broadly elliptical, rim flat (without proximally-directed wall), radial laths stubby showing distinct obliquity, central plate quadrate.

Size: Coccospheres 6-10 µm; BCs 2-3 µm

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, grill, plate,
CSPH: equant, elongated, XC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 2->3µm; Coccosphere size: 6.5->8.5µm; Liths per sphere: 30->60
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

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. 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 ampliora compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-8-2021

Taxon Search:
Advanced Search

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

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics