Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
| Hexalithus Six-rayed, stellate to hexagonal nannoliths. | |||||
| Polycostella Globular and stellate nannoliths formed of 5-8 segments of stacked elements. Nannoconus-like in side view. | Polycostella senaria Polycostella transitoria Polycostella beckmannii Polycostella parvistellatus Polycostella sp. | ||||
Distinguishing features:
Parent taxon (Braarudosphaerales): 2N(?) cell covered by nannoliths with lamellar sub-structure and tangential C-axes. N: cell motile, covered by scales
This taxon: Nannoliths intermediate between Nannoconacaea and Braarudosphaeraceae
| Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): at top of Campanian Stage (100% up, 72.2Ma, in Campanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NJT15b subzone (145.72-147.01Ma, base in Tithonian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
![]() |
Transitional genera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-9-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11375 Go to Archive.is to create a permanent copy of this page - citation notes |
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