Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
D. sanmiguelensis & variants - distal boss inside central area | |||||
![]() | Discoaster sanmiguelensis A species of the D. sanmiguelensis group with parallel-sided rays and hexagonal central area periphery. | ||||
![]() | Discoaster ulnatus A species of the D. sanmiguelensis group with relatively long rays that taper to form clubbed termi- nations. | ||||
![]() | Discoaster patulus A species of the D. sanmiguelensis group with rays that taper and then flare to form clubbed termi- nations. | ||||
D. musicus & variants - distal boss ridges extend beyond c area | |||||
![]() | ![]() | Discoaster musicus Similar to D. exilis , but with wide central area and large distal boss, prominent sutural ridges extending between the rays. | |||
![]() | Discoaster carneyi A species of the D. musicus group having slender, tapered rays with simple bifurcations | ||||
Catinaster-like forms | |||||
Discoaster virginianus small to medium sized Catinaster-like species with stem on both proximal and distal sides | |||||
Discoaster transitus Small thick discoaster with small central area, bifurcations nearly touching | |||||
![]() | ![]() | Discoaster micros Small discoaster with short arms; bifurcations almost touching and thicker than the arms | |||
![]() | Discoaster arneyi A thick species of the D. micros group with long rays, nearly flat bifurcations and a featureless central area. | ||||
![]() | Discoaster premicros A thick species of the D. micros group with short rays, flat bifurcations and a featureless central area |
Taxonomy:
Farinacci & Howe catalog pages: Discoaster musicus 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 (24% up, 10.6Ma, in Tortonian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Langhian Stage (49% up, 14.9Ma, in Langhian 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. musicus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1544 Go to Archive.is to create a permanent copy of this page - citation notes |