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 | Syracosphaera aurisinae Syracosphaera tumularis Syracosphaera sp. cf. tumularis 1 Syracosphaera sp. cf. tumularis 2 Syracosphaera gaarderae Syracosphaera rhombica | ||||
| 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) | Syracosphaera leptolepis Syracosphaera nana Syracosphaera nodosa Syracosphaera serrata Syracosphaera sp aff nana | ||||
| 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 | |||||
Distinguishing features:
Parent taxon (Syracosphaera): Coccospheres usually dithecate. Exothecal coccoliths (XCs) highly variable. Endothecal coccoliths are muroliths with 1, 2 or 3 flanges, the forms with 2 flanges are often placolith-like.
This taxon: BCs muroliths, without distinct inner wall cycle; laths rather broad. XCs planoliths.
| Lith size: 1->4µm; Coccosphere size: 4->40µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Pliocene Epoch (2.59-5.33Ma, base in Zanclean stage). Data source: Total of ranges 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. S1: 1-132. gs References:

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SY nodosa gp compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-7-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1332 Go to Archive.is to create a permanent copy of this page - citation notes |
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