Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
D. exilis and variants | |||||
![]() | ![]() | Discoaster exilis Small central-area; usually with weak distal and proximal bosses; bifurcations acutely angled in plan-view | |||
![]() | Discoaster cauliflorus large stellate stem and wide bifurcations | ||||
![]() | ![]() | Discoaster moorei Asymetric 5-rayed discoaster with bifurcations. | |||
![]() | Discoaster extensus Ray bifurcations curve proximally | ||||
![]() | Discoaster discissus Wide, tapering rays with notched tips. | ||||
D. bollii | |||||
![]() | ![]() | ![]() | Discoaster bollii Similar to D. exilis but with large distal boss, small proximal boss, and wide central-area, and usually smaller (<10µm). | ||
D. petaliformis & similar | |||||
![]() | Discoaster petaliformis Similar to D. exilis but with very large mushroom-shaped distal boss and distinct proximal boss. Central-area narrow. | ||||
![]() | Discoaster signus Similar to D. petaliformis but with longer bifurcations, and weaker boss. | ||||
![]() | Discoaster apetalus Like D. petaliformis but without the central boss |
Taxonomy:
Farinacci & Howe catalog pages: Discoaster exilis group [no catalog entry yet]
Search data:Tags | LITHS: |
Metrics | Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): in mid part of Tortonian Stage (48% up, 9.5Ma, in Tortonian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Burdigalian Stage (56% up, 17.9Ma, in Burdigalian 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:
![]() |
D. exilis group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-1-2021
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1547 Go to Archive.is to create a permanent copy of this page - citation notes |