Syracosphaera oneillii

Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> Syraco - fossil -> Syracosphaera oneillii
Sister taxa: N. franzii, S. clathrata, S. croatica, S. fragilis, S. horvati, S. monechiae, S. octiforma, S. oneillii, S. raffiae, S. tanzanensis, S. sp. fossil


Citation: Syracosphaera? oneillii da Gama & Varol 2013
Rank: Species

Distinguishing features: Small elliptical coccolith with birefringent inner cycle and non-birefringent outer cycle.

Original description: Diagnosis: Small elliptical coccolith consisting of a non-birefringent outer cycle and birefringent inner cycle.

Description: This elliptical coccolith is made up of two cycles of elements. The outer cycle is non-birefringent whilst the inner cycle is birefringent. No structure was observed in the central area. Examination under SEM is necessary to understand the true structure of this small species.

Farinacci & Howe catalog pages: S. oneillii *

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, CROSS-POLARS: rim-bicyclic, R-prominent, T-prominent,
MetricsLith size: 3->5µm;
Data source notes: lith length from OD and slightly extended
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN10 zone (8.29-9.53Ma, top in Tortonian stage). Data source: da Gama & Varol 2013
First occurrence (base): within NN7 zone (10.89-11.90Ma, base in Serravallian stage). Data source: da Gama & Varol 2013

Plot of occurrence data:


da Gama, R. O. B. P. & Varol, O. (2013). New Late Oligocene to Miocene Species. Journal of Nannoplankton Research. 33(1): 1-12. gs V O


Syracosphaera oneillii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-6-2021

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

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