|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Similar to S. nodosa type but XCs robust with broad rim, curved sutures and conical central structure.
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
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|
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.
XCs consist partly or entirely of several layers of superposed elements. CFCs with spines
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:
|Metrics||Lith size: 1->4µm; Coccosphere size: 4->40µm;|
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:
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