|Daughter taxa: species arranged in stratigraphic order, youngest at top (blue => in age window 0-800Ma)|
|S. heteromorphus & variants|
|S. delphix and variants|
Distinguishing features: Late Oligocene - Early Miocene sphenoliths with apical spines formed from a single element.
Farinacci & Howe catalog pages:
Morphology remarks: The spines go into extinction as a single unit when they are aligned with the polarisation directions
|Tags||LITHS: N: 3D-radiate, conical, RIM: tiered, PROCESS: length-fast, monocrystalline, spine, |
CSPH: not known, V-UNITS: spine, R-UNITS: lower-tier, middle-tier, DETAILS: isogyres radial,
|Metrics||Lith size: 4->20µm; |
Notes: S. heteromorphus and S. belemnos are common species and key biostratigraphic markers. S. delphix, S. capricornutus and S. calyculus are a group of relatively rare small species with well-developed apical spines characteristic of the Earliest Miocene.
Last occurrence (top): near base of Serravallian Stage (13% up, 13.5Ma, in Serravallian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Rupelian Stage (74% up, 29.6Ma, in Rupelian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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