Curved rays extend beyond basket
Rays bifurcate to form distal rim of basket, but do not extend significantly beyond it
Specimens which cannot be assigned to established species
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| | | | Catinaster calyculus Curved rays extend beyond basket |
| | | | Catinaster coalitus Rays bifurcate to form distal rim of basket, but do not extend significantly beyond it |
| Catinaster sp. Specimens which cannot be assigned to established species | |||
Raffi et al 1998-29.JPGTaxonomy:
Distinguishing features:
Parent taxon (Discoasteraceae): Discoidal discoasteralids formed of one, non-birefringent in plan view, cycle.
This taxon: Discoasterids with bifurcate ray tips that meet to form a basket like structure
Farinacci & Howe catalog pages: Catinaster *
Catinasters are rather curious sub-cylindrical or cup-shaped nannofossils. They have six-fold radial symmetry and the same crystallographic orientation as discoasters. There are two main species, C. coalitus which has septae-like radial structures confined to the cup, and C. calyculus in which radial structures extend beyond the cup. The cup was probably formed by fusion of the bifurcations of a small discoaster (Martini & Worsley 1971, Peleo-Alampay et al., 1998).
Morphology:
| LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
| Lith size: 4->13µm; Segments: 6->6; |
Geological Range:
Last occurrence (top): at top of NN10 zone (100% up, 8.3Ma, in Tortonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NN8 zone (10.55-10.89Ma, base in Tortonian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Martini, E. & Bramlette, M. N. (1963). Calcareous nannoplankton from the experimental Mohole drilling. Journal of Paleontology. 37(4): 845-855. gs Martini, E. & Worsley, T. (1971). Tertiary calcareous nannoplankton from the western equatorial Pacific. Initial Reports of the Deep Sea Drilling Project. 7: 1471-1507. gs Peleo-Alampay, A., Bukry, D., Liu, L. & Young, J. R. (1998). Late Miocene calcareous nannofossil genus Catinaster: taxonomy, evolution and magnetobiostratigraphy. Journal of Micropalaeontology. 17(1): 71-85. gs Raffi, I., Backman, J. & Rio, D. (1998). Evolutionary trends of tropical calcareous nannofossils in the late Neogene. Marine Micropaleontology. 35(1): 17-41. gs Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs References:
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Catinaster compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2023
Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=239 Go to Archive.is to create a permanent copy of this page - citation notes |
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