Classification: Coccolithophores -> Nannolith families inc sed -> Lithostromationaceae -> Imperiaster
Sister taxa: Lithostromation, Imperiaster, Lacunolithus, Martiniaster, Isolithus,

Daughter taxa: (blue => in age window 0-800Ma)


Citation: Imperiaster Martini 1970
Rank: Genus
Type species: Discoaster obscurus Martini 1958

Distinguishing features: Very large (15-30 µm) nannolith formed of 6 rays in two superposed offset triplets

Farinacci & Howe catalog pages: Imperiaster *

Search data:
TagsLITHS: nannolith-radiate, N: 3D-radiate, star-shaped,
CSPH: not known, V-UNITS: all, V-prominent, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 15->30µm; Segments: 6->6;
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 Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Martini, E. (1958). Discoasteriden und verwandte Formen im NW-deutschen Eozän (Coccolithophorida). 1. Taxonomische Untersuchungen. Senckenbergiana Lethaea. 39: 353-388. gs

Martini, E. (1970a). Imperiaster n. g. aus dem europäischen Unter-Eozän (Nannoplankton, incertae sedis). Senckenbergiana Lethaea. 51: 383-386. gs

Perch-Nielsen, K. (1968c). 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: 28-3-2020

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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