Syracosphaera epigrosa

Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> molischii type -> Syracosphaera epigrosa
Sister taxa: S. andruleitii, S. molischii, S. hastata, S. marginiporata, S. ossa, S. epigrosa


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

Distinguishing features: BCs like S. ossa but with central ring of nodes; CFCs like S. ossa, with flattened spine; XCs not known

Farinacci & Howe catalog pages: S. epigrosa *

Morphology: This is a poorly known form with only a few definite specimens illustrated, and no observations on XCs. The BCs are similar to those of S. ossa but with a central ring of high nodes formed by growth up from laths. The XCs are shown on an image here and are similar to those of S. ossa, with a sail-like spine aligned parallel to the long-axis of the coccolith. We suspect that it will prove to have XCs similar to those of S. ossa and may even prove to be an ornamented variety of S. ossa rather than a discrete species.

Size: Coccospheres 8-13 µm; BCs 1-3 µm.

Search data:
TagsLITHS: murolith, placolith, SHAPE: elliptical, CA: ca_disjunct, grill, process,
CSPH: equant, CFC, XC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 1->3.2µm; Coccosphere size: 8->13µm; Liths per sphere: 30->50
Data source notes: lith length (BCs) from OD & illustrated specimens; 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:


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 epigrosa compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-5-2021

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

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