Discoaster transitus


Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. musicus group -> Discoaster transitus
Sister taxa: D. sanmiguelensis, D. ulnatus, D. patulus, D. musicus, D. carneyi, D. virginianus, D. transitus, D. micros, D. arneyi, D. premicros,

Taxonomy:

Citation: Discoaster transitus Peleo-Alampay et al. (1998)
Rank: species
Notes & discussion: D. transitus was considered to be a synyonym of D. micros by Raffi et al. (1998) but the species are separated by Bergen et al. (2017) on the basis of central area size. The specimens illustrated by Raffi et al. (1998) have small central areas and so are reassigned to D. transitus. [my interpretation - JRY 2018]

Distinguishing features: Small thick discoaster with small central area, bifurcations nearly touching

Farinacci & Howe catalog pages:


Evolution & Phylogeny: Suggested to be the ancestor of Catinaster coalitus by Peleo-Alampay et al. (1998) and Raffi et al. (1998)

Search data:
TagsLITHS: nannolith-radiate, star-shaped, DETAILS: 1ou,
MetricsLith size: 0->0µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN9 zone (9.53-10.55Ma, top in Tortonian stage). Data source: de Kaenel et al 2017; Peleo-Alampay et al. 1998
First occurrence (base): within NN8 zone (10.55-10.89Ma, base in Tortonian stage). Data source: de Kaenel et al 2017; Peleo-Alampay et al. 1998

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: D. musicus group

    References:

    Bergen, J. A., de Kaenel, E., Blair, S. A., Boesiger, T. M. & Browning, E. (2017). Oligocene-Pliocene taxonomy and stratigraphy of the genus Sphenolithus in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 77-112. gs :: view :: open

    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 :: view :: open

    Peleo-Alampay, A., Bukry, D., Liu, L. & Young, J. R. (1998). Magnetobiostratigraphic calibration of datums from the late Miocene calcareous nannofossil genus Catinaster and discussion of its evolution. Journal of Micropalaeontology. 17(1): 71-85. gs :: view :: open

    Raffi, I., Backman, J. & Rio, D. (1998). Evolutionary trends of tropical calcareous nannofossils in the late Neogene. Marine Micropaleontology. 35(1): 17-41. gs :: ::


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    Discoaster transitus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-6-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1578 Go to Archive.is to create a permanent copy of this page - citation notes



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