Intergrades with D. mediosus (see Remarks for that species).
As originally described D. binodosus contained two sub-species Discoaster binodosus subsp. binodosus (with rounded/pointed ray tips) and Discoaster binodosus subsp. hirundinus (with notched ray tips). The hirundinus form is now regarded as a synonym of D. nodifer.
Distinguishing features:
Parent taxon (D. nodifer group): Stellate discoasters with straight rays; rays free for >1/3 of their length; rays with bifurcations or nodes; 5-10 rays
This taxon: Usually 8 rays with free ray length that approaches half the diameter of the central area or greater and prominent lateral nodes and pointed ray tips.
See also: Discoaster mediosus - similar but central area broader;Discoaster nodifer - similar but central area narrower; ;
Search data:| LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
| Lith size: 8->17µm; Segments: 8->8; Data source notes: size from Romein 1979 & OD |
Geological Range:
Last occurrence (top): within NP15c subzone (42.87-44.12Ma, top in Lutetian stage). Data source: PRB entry to Nannotax
First occurrence (base): within NP10 zone (54.17-55.86Ma, base in Ypresian stage). Data source: PRB entry to Nannotax
Plot of occurrence data:
Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O 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 Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs O Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs Deflandre, G. (1952a). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In, Grassé, P. P. (ed.) Traité de Zoologie. Masson, Paris 439-470. gs Martini, E. (1958). Discoasteriden und verwandte Formen im NW-deutschen Eozän (Coccolithophorida). 1. Taxonomische Untersuchungen. Senckenbergiana Lethaea. 39: 353-388. gs Martini, E. (1961). Nannoplankton aus dem Tertiär und der obersten Kreide von SW-Frankreich. Senckenbergiana Lethaea. 42: 1-32. gs Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs Noël, D. (1960). Revison du genre Discoaster Tan Sin Hok 1927. Universite d'Alger, Fac, des Sciences, . 201-232. gs Perch-Nielsen, K. (1967). Nannofossilien aus dem Eozan von Danemark. Eclogae Geologicae Helvetiae. 60: 19-32. gs O Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs O Perch-Nielsen, K., Sadek, A., Barakat, M. G. & Teleb, F. (1978). Late Cretaceous and Early Tertiary Calcareous nannofossil and Planktonic foraminifera zones from Egypt. Actes du VI Colloque Africain de Micropaléontologie - Tunis 1974. Annales des Mines et de la Géologie Tunissienne. 28: 337-403. gs Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs O Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 36(1): 33-59. gs O Theodoridis, S. (1983). On the legitimacy of the generic name Discoaster Tan 1927 ex Tan 1931. INA Newsletter. 5(1): 15-21. gs Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs O Varol, O. (1989b). Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología. 21: 273-320. gs References:

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Discoaster binodosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-9-2026
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