Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
![]() | ![]() | Discoaster deflandrei 6-rayed discoaster with a well developed central area; rays ending in strong short wide bifurcations. | Discoaster calculosus ![]() Discoaster salomonii ![]() Discoaster emblematicus ![]() Discoaster durioi ![]() Discoaster saundersi ![]() Discoaster nephados ![]() Discoaster leroyi ![]() | ||
![]() | ![]() | Discoaster kugleri Central-area wide and flat. Free rays short, with notched ends rather than true bifurcations; often thicker than the central area. | |||
![]() | Discoaster druggii Like D. deflandrei but larger, >15µm, and without distinct bifurcations |
Taxonomy:
Distinguishing features:
Parent taxon (Discoaster): Radiate nannoliths with each ray formed of a discrete crystal-unit, with the c-axes perpendicular to the nannolith surface.
This taxon: Complanate 6-rayed discoasters with robust bifurcations and smple central-areas
Farinacci & Howe catalog pages: Discoaster deflandrei group [no catalog entry yet]
Search data:
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): at top of NN8 zone (100% up, 10.6Ma, in Tortonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP10 zone (54.17-55.86Ma, base in Ypresian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
![]() |
D. deflandrei group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2023
Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=1543 Go to Archive.is to create a permanent copy of this page - citation notes |
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