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Discoaster
Discoaster
is a genus of extinct star-shaped marine algae, with calcareous exoskeletons of between 5-40 μm across that are abundant as nanofossils in tropical deep-ocean deposits of Neogene
Neogene
age. Discoaster
Discoaster
belongs to the haptophytes. About 100 species can be recognized.[2] Biostratigraphic significance[edit] The International Commission on Stratigraphy (ICS) has assigned the extinction of Discoaster
Discoaster
brouweri as the defining biological marker for the start of the Calabrian Stage of the Pleistocene, 1.806 million years ago. ICS has assigned the extinction of Discoaster
Discoaster
pentaradiatus and Discoaster
Discoaster
surculus as the defining biological marker for the start of the Gelasian Stage, 2.588 million years ago, the earliest stage of the Pleistocene. ICS further assigned the extinction of Discoaster
Discoaster
kugleri as biological marker for the start of the Tortonian Stage of the Miocene, 11.62 million years ago. Species[edit] Some species in this genus include:[3] [4]

D. asymmetricus Gartner D. bellus Bukry and Percival D. berggrenii Bukry D. bollii Martini and Bramlette D. brouweri Bramlette and Riedel D. calcaris Gartner D. exilis Martini and Bramlette D. hamatus Martini and Bramlette D. intercalaris Bukry D. kugleri Martini and Bramlette, 1963 D. loeblichii Bukry D. neohamatus Bukry and Bramlette D. neorectus Bukry D. pentaradiatus (Tan) Bramlette and Riedel D. quintatus Gartner D. surculus Martini and Bramlette D. toralus Ellis, Lohmann and Wray D. triradiatus Tan D. variabilis Martini and Bramlette

References[edit]

^ Bukry, David (1971). " Discoaster
Discoaster
Evolutionary Trends". Micropaleontology. The Micropaleontology Project, Inc. 17 (1): 43. doi:10.2307/1485036. JSTOR 1485036.  ^ "Discoasters". Springer. Retrieved 4 July 2013.  ^ Raffi, I; C. Mozzato; E. Fornaciari; F. J. Hilgen; D. Rio (Spring 2003). "Late Miocene
Miocene
Calcareous Nannofossil Biostratigraphy and Astrobiochronology for the Mediterranean Region". Micropaleontology. The Micropaleontology Project, Inc. 49 (1): 1–26. doi:10.1661/0026-2803(2003)049[0001:LMCNBA]2.0.CO;2.  ^ Guiry, M.D.; Guiry, G.M. (2008). "Discoaster". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2009-02-21. 

Taxon identifiers

Wd: Q5281570 AlgaeBase: o5a849cba3c2d1b7b EoL: 89637 Fossilworks: 87682 ITIS: 2273

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