Daughter taxa (time control age-window is: 0-800Ma)![]() | |||||
D. deflandrei and variants | |||||
![]() | ![]() | Discoaster deflandrei 6-rayed discoaster with a well developed central area; rays ending in strong short wide bifurcations. | |||
![]() | Discoaster calculosus broad central area, large (>15 µm) with "broad & shallow inter-ray areas | ||||
![]() | Discoaster salomonii broad central area | ||||
![]() | Discoaster emblematicus broad central-area, ornate & broadly rounded bifurcation | ||||
![]() | Discoaster durioi ornate central-area & angular bifurcation | ||||
![]() | Discoaster saundersi ornate central-area & angular bifurcation | ||||
Discoaster nephados short flaring rays & very broad bifurcation | |||||
![]() | Discoaster leroyi 5-rayed variant of D. deflandrei | ||||
D. kugleri and variants | |||||
![]() | ![]() | Discoaster kugleri Central-area wide and flat. Free rays short, with notched ends rather than true bifurcations; often thicker than the central area. | |||
Discoaster hexapleuros Like D. kugleri but with parallel-sided rays and hexagonal central area periphery. | |||||
Discoaster cuspidatus Like D. kugleri but with longer, tapering rays. | |||||
D. druggii and variants | |||||
![]() | Discoaster druggii Like D. deflandrei but larger, >15µm, and without distinct bifurcations | ||||
Discoaster shumnykii |
Taxonomy:
Distinguishing features: Complanate 6-rayed discoasters with robust bifurcations and smple central-areas
Farinacci & Howe catalog pages: Discoaster deflandrei group [no catalog entry yet]
Search data:Tags | LITHS: |
Metrics | Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): in lower part of Tortonian Stage (17% up, 10.9Ma, in Tortonian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Ypresian Stage (67% up, 50.5Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
de Kaenel, E., Bergen, J. A., Browning, E., Blair, S. A. & Boesiger, T. M. (2017). Uppermost Oligocene to Middle Miocene Discoaster and Catinaster taxonomy and stratigraphy in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 215-244. gs V OReferences:
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D. deflandrei group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1543 Go to Archive.is to create a permanent copy of this page - citation notes |