|Daughter taxa: (blue => in age window 0-800Ma)||Granddaughter taxa|
Heterococcoliths asymetric, arranged in meridional rows on coccosphere; V-unit forms flange, R-unit basal. Also nannolith phase "Polycrater" with quadrate aragonitic liths.
Narrow-rimmed muroliths, mostly with prominent central structures.
Placolith-like with distal shield much larger than proximal, predominantly formed from R-units, V-units vestigial.
|narrow rimmed placoliths|
Diverse group of coccoliths with narow placolith rims and variable central strcutrues, usually showing four-fold symmetry
|Coccolith genera inc sed|
Heterococcolith genera which cannot be assigned to any family
Specimens which cannot be assigned to established taxa
Distinguishing features: Various heterococcolith groups not obviously related to the well-defined orders
Farinacci & Howe catalog pages: Coccolith families inc sed [no catalog entry yet]Search data:
|Metrics||Lith size: 0->0µm;|
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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