|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 with the rim apparently formed from a single cycle of elements. Addtional elements are present in the central area of C. simplex but absent from it (possibly due to preservation) in C. scissurata. 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.
Dimorphic - BCs tube-like; AACs simple plates, typically formed of two elements.
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
Parent taxon (Coccolith families inc sed): 2N: Various heterococcolith groups not obviously related to the well-defined orders
N: mostly unknown
This taxon: Heterococcolith genera which cannot be assigned to any family
Farinacci & Howe catalog pages: Coccolith genera inc sed [no catalog entry yet]
|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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