Distinguishing features: Cylindrical, barrel-shaped or slightly tapering nannoconids with moderately wide central canals (ct ≈ wt).
|Daughter taxa: (blue => in age window 0-800Ma)||Granddaughter taxa|
Quadriangular with horns and bosses on the outer wall.
Quadriangular (height = width) with slightly concave outer walls
Tall and cylindrical (height ~2x width).
Small (height 2 microns, width 3.5 µm), short (width>height) and cylindrical.
Tall (at least twice as tall as wide) with parallel sides and slightly bulbous base.
Relatively small (type material diameter 5.0-6.5 µm), cylindrical and moderately tall (height = width).
Tall (height 10.5-20.0 µm), elongate and cylindrical with one or two constrictions.
Tall, quadriangular nannoconid with cavity similar in width to the wall.
quadriangular (height = width).
large, quadriangular to elongate (similar height and width).
Barrel-shaped or slightly tapering
Farinacci & Howe catalog pages: N. truitti group [no catalog entry yet]
Distinguishing features: Cylindrical, barrel-shaped or slightly tapering nannoconids with moderately wide central canals (ct ≈ wt).Search data:
|Tags||LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,|
|Metrics||Lith size: 2->25µm; |
Data source notes: size range of included species
Last occurrence (top): at top of Campanian Stage (100% up, 72.1Ma, in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Valanginian Stage (0% up, 139.4Ma, in Valanginian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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