|Daughter taxa (time control age-window is: 0-800Ma)|
Variably tall cylindrical nannofossils with a narrow axial canal, that flare from a small basal disc to form a trumpet shape. Formed from a single cycle of crystal units with co-planar radial c-axes.
Specimens which cannot be assigned to any established species
Distinguishing features: 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.
Farinacci & Howe catalog pages: Leesella *Search data:
|Tags||LITHS: placolith, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: rim-unicyclic, R-prominent,|
|Metrics||Lith size: 2->7µm;|
Last occurrence (top): in lower part of Bartonian Stage (22% up, 40.4Ma, in Bartonian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Lutetian Stage (74% up, 42.9Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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