SY nodosa gp

Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY nodosa gp
Sister taxa: SY pulchra gp, SY molischii gp, SY nodosa gp, SY mediterranea group, Syraco - fossil, S. sp.

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
XCs symmetric
anthos type
Similar to S. nodosa type but XCs robust with broad rim, curved sutures and conical central structure.

lamina type
Similar to S. nodosa type, but XCs large and rather weakly calcified with only narrow radial cycle. BCs thin-walled with crenulate top. No spines on CFCs so endotheca monomorphic

nodosa type
XCs planoliths, circular to elliptical, radial cycle variably developed, form complete exotheca. BCs muroliths with proximal flange; wall slightly flaring; no spines; sharp radial laths. CFCs with spines (except Syracosphaera leptolepis)

XCs asymmetric, form chains
bannockii type
XCs are irregular planoliths, asymmetric rim, narrow medial cycle, often occurring in a ribbon-like arrangement. BCs muroliths with proximal flange; wall low; radial laths rather broad and flat. CFCs have spines, with simple rounded tips.

laminated type
XCs consist partly or entirely of several layers of superposed elements. CFCs with spines


Citation: SY nodosa gp Young et al., 2003
Rank: species group

Distinguishing features: BCs muroliths, without distinct inner wall cycle; laths rather broad. XCs planoliths.

Farinacci & Howe catalog pages: SY nodosa gp [no catalog entry yet]

Search data:
MetricsLith size: 1->4µm; Coccosphere size: 4->40µm;
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: Total of range of species in this database
First occurrence (base): at base of Gelasian Stage (0% up, 2.6Ma, in Gelasian stage). Data source: Total of range of species in this database

Plot of occurrence data:


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


SY nodosa gp compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-5-2021

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

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