|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Monomorphic - cavate
Coccoliths with broad rim and recessed distal cover without boss
Monomorphic; liths solid - formed of layers of crystallites in rhomboid array
Coccolith distal surface with central boss and varying number of depressions.
Dimorphic - liths cavate
BCs flat topped with large openings in tube and variable openings in distal surface; tiered wall fabric; low transverse ridge.
CFCs helladoliths - ridge of BCs is extended into prominent leaf, no openings in tube.
|S. mediterranea HOL type|
Dimorphic - usually cavate
BCs with flat distal cover with or without openings; central boss
CFCs; with irregular bridge or distal cover arched upwards
S. histrica HOL
S. mediterranea HOL gracillima type
S. mediterranea HOL hellenica type
S. mediterranea HOL wettsteinii type
Dimorphic; liths semi-solid - formed of concentric rings of crystallites.
BCs flat topped with node or ridge on distal surface, rather than a true bridge.
CFCs similar with transverse bridge or leaf.
Distinguishing features: Holococcoliths with tube, covered distally by a flat cover
Farinacci & Howe catalog pages: flat-topped [no catalog entry yet]Search data:
|Metrics||Lith size: 1.6->3.3µm;|
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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