Citation: Imperiaster Martini 1970Rank: GenusType species: Discoaster obscurus Martini 1958
Distinguishing features: Parent taxon (Lithostromationaceae): Large (10-20µm) triangular to stellate nannoliths with porous structure formed from small crystallites. In xpl behave as single crystal unit with low birefringence This taxon: Very large (15-30 µm) nannolith formed of 6 rays in two superposed offset triplets
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): at top of Tortonian Stage (100% up, 7.3Ma, in Tortonian stage). Data source: Total of range of species in this database First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Thanetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Martini, E. (1958). Discoasteriden und verwandte Formen im NW-deutschen Eozän (Coccolithophorida). 1. Taxonomische Untersuchungen. Senckenbergiana Lethaea. 39: 353-388. gs
Martini, E. (1970). Imperiaster n. g. aus dem europäischen Unter-Eozän (Nannoplankton, incertae sedis). Senckenbergiana Lethaea. 51: 383-386. gs
Perch-Nielsen, K. (1968). Der Feinbau und die Klassifikation der Coccolithen aus dem Maastrichtien von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 16: 1-96. gs
Imperiaster compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-6-2023
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