arrayname: original
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
Praeprinsius vegrandis Very small (1.5–2.5 μm), circular to subcircular placoliths with around 8 rim elements and a very narrow central area. | ||||
Praeprinsius tenuiculus Very small to small circular to subcircular placoliths with narrow, but distinct, central opening (‘bullseye’). |
Taxonomy:
Distinguishing features:
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 (1-4 µm), circular to sub-circular, coccospheres with numerous coccoliths
Farinacci & Howe catalog pages: Praeprinsius *
Search data:
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): at top of NP4 zone (100% up, 61.5Ma, in Selandian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Varol, O. & Jakubowski, M. (1989). Some new nannofossil taxa. INA Newsletter. 11(1): 24-29. gs References:
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Praeprinsius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-4-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1810 Go to Archive.is to create a permanent copy of this page - citation notes |
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