Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Discoasteraceae Discoidal discoasteralids formed of one, non-birefringent in plan view, cycle. | |||||
Fasciculithaceae Conical or cylindrical discoasteralids consisting of 10-30 wedge-shaped, radially-arranged elements, in one to three superposed cycles. | |||||
Heliolithaceae Discoidal discoasteralids with several distinct cycles including at least one that is birefringent. | |||||
Sphenolithaceae Conical discoasteralids with a concave base, consisting of a mass of elements radiating from a common origin. |
Taxonomy:
The term discoasteralids is used here as a concise term for nannoliths produced by members of the order Discoasterales.
Distinguishing features:
Parent taxon (ntax_cenozoic): Extant coccolithophores and Cenozoic calcareous nannofossils - Mesozoic nannofossils are in a separate module
This taxon: Radially symmetrical nannoliths formed from one to several separate cycles of elements that radiate from a common centre or axis.
Original description: Diagnosis: All tubular, and disc-, dome-, star-, tower-, or umbrella-shaped nannofossils.
Farinacci & Howe catalog pages: Discoasterales *
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 NP4 zone (61.51-63.25Ma, base in Danian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs O Hay, W. W. (1977). Calcareous nannofossils. In, Ramsay, A. T. S. (ed.) Oceanic Micropalaentology. Academic Press, London (2): 1055-1200. 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 Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs References:
Discoasterales compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=517 Go to Archive.is to create a permanent copy of this page - citation notes |
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