|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Placolith with strongly distal shield, showing high birefringence
Circular to stellate placoliths contructed from 6-12, large, radial elements. Often give the appearance of stellate nannoliths with low birefringence in LM.
Small, inconspicuous 3-tiered placoliths with central area spanned by diagonal cross bars.
Small oblong placolith coccoliths apparently formed from single cycle of elements. Numerous coccoliths per coccosphere
Elliptical to oblong placoliths with shields formed from numerous narrow elements and central areas spanned by plates that may be perforate.
Placolith-like coccoliths, with distal shield reduced to ring of spines.
Relatively tall nannofossils that flare from a small basal disc to form a trumpet shape. They have a narrow, axial canal and are usually seen in side view.
Typically circular planolith coccoliths with broad, flat shield and rim elements joined along inclined sutures. Shield is dark in XPL but a narrow, brighter tube cycle may be present.
Medum-sized, narrow-rimmed placolith surmounted by domal protrusion with hexagonal pores
Distinguishing features: Heterococcolith genera which cannot be assigned to any family
Farinacci & Howe catalog pages: Coccolith genera 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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