Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Discoaster Radiate nannoliths with each ray formed of a discrete crystal-unit, with the c-axes perpendicular to the nannolith surface. | D. brouweri group D. pentaradiatus group D. quinqueramus group D. variabilis group D. exilis group D. musicus group D. deflandrei group D. nodifer group D. lodoensis group D. multiradiatus group D. araneus group Discoaster sp. | ||||
Catinaster Discoasterids with bifurcate ray tips that meet to form a basket like structure (Miocene) | |||||
Candeodiscoaster Ancestral discoasterids, with a birefingent central cycle (Paleocene) |
Taxonomy:
Distinguishing features:
Parent taxon (Discoasterales): Radially symmetrical nannoliths formed from one to several separate cycles of elements that radiate from a common centre or axis.
This taxon: Discoidal discoasteralids formed of one, non-birefringent in plan view, cycle.
Farinacci & Howe catalog pages: Discoasteraceae
Morphology:
Phylogenetic relations
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): at top of NN18 zone (100% up, 1.9Ma, in Gelasian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP7 zone (58.70-58.97Ma, base in Thanetian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Bukry, D. (1971a). Discoaster evolutionary trends. Micropaleontology. 17: 43-52. gs Perch-Nielsen, K. (1985). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge (1): 427-555. gs Tan Sin Hok, (1927). Discoasteridae incertae sedis. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. Sect Sci, 30: 411-419. gs References:
Discoasteraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=516 Go to Archive.is to create a permanent copy of this page - citation notes |
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