|Daughter taxa (time control age-window is: 0-800Ma)|
Very small elliptical placoliths with narrow to closed central area.
Very small elliptical placoliths with open central area spanned by a net.
Specimens which cannot be assigned to any established species
Parent taxon (Prinsiaceae): Placoliths with R-units forming the lower layer of proximal shield, inner tube and middle tube; V-units forming an upper layer to the proximal shield, outermost tube and the distal shield. In LM they display a dark outer cycle and brighter inner cycle. Central-area structures are conjunct, formed from the R-units.
This taxon: Very small to small placoliths with closed or narrow central areas. Shields are dark in XPL with bright tube cycle.
Farinacci & Howe catalog pages: Neobiscutum *
|LITHS: placolith, elliptical, CA: ca_conjunct, |
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
|Lith size: 2->3µm;|
Last occurrence (top): near base of Danian Stage (13% up, 65.5Ma, in Danian stage). 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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