|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Elliptical placoliths with broad shields with or without a prominent inner tube cycle; the central-area may be imperforate or narrow and vacant or spanned by a simple structure (plate, cross or bar).
Parent taxon (Mesozoic Survivors): Mesozoic taxa which occur in low abundances in the early Palaeogene.
This taxon: Placoliths with two broad shields; central area narrow; distal shield formed from V-units; proximal shield and tube formed from R-units.
Farinacci & Howe catalog pages: Biscutaceae [no catalog entry yet]
|Metrics||Lith size: 3->10µm;|
Last occurrence (top): in lower part of Lutetian Stage (23% up, 46.3Ma, in Lutetian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Berriasian Stage (0% up, 145Ma, in Berriasian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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