Daughter taxa (time control age-window is: 0-800Ma)![]() | |||||
species are organised here primarily by number of rays | |||||
![]() | ![]() | ![]() | ![]() | Discoaster pacificus Large to very large (15-25 µm) rosette-shaped discoasters with prominent bosses on both sides and 8-19 short free rays that typically curve. | |
![]() | ![]() | ![]() | ![]() | Discoaster falcatus Large to very large stellate discoasters with a low boss on one side and 7-10 (commonly 9) curving rays joined along half their length with a ridge on one side. | |
![]() | Discoaster saipanensis Discoasters with 5-8 (normally 6 or 7) straight or curved rays joined through half their length and which then taper to a point. A central stem and distinct radial sutural ridges and depressions are visible in some specimens | ||||
Discoaster lodoensis Large to very large stellate discoasters with a central boss on one side and 5-7 (typically 6) curving rays joined along 1/2 to 1/3 their length with a ridge on one side. | |||||
![]() | ![]() | ![]() | ![]() | Discoaster sublodoensis Five (less commonly 6) rayed discoaster with a small stem on one side and sharply tapering, straight, pointed rays joined along half their length. | |
Discoaster mahmoudii Distinctive stellate discoaster with 5 or 6 tapering free rays and a central area crossed by high inter-ray ridges that form a stellate boss. | |||||
![]() | Discoaster paelikei Stellate discoaster with 5-6 (rarely 7) rays that taper to pointed tips. The central area is characterised by clockwise curving sutures on one side and a flower-like boss on the other. In 5-rayed specimens the rays can be slightly asymmetrical. |
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: Stellate discoasters with curved rays; rays free for >1/3 of their length; rays without bifurcations or nodes; 5-10 rays
Farinacci & Howe catalog pages:
Search data:
Lith size: 4->26µm; |
Geological Range:
Last occurrence (top): at top of NP19-20 zone (100% up, 34.4Ma, in Priabonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP8 zone (57.21-58.7Ma, base in Thanetian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
![]() |
D. lodoensis 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=420 Go to Archive.is to create a permanent copy of this page - citation notes |
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