Discoaster
| Discoaster Temporal range: | |
|---|---|
 | |
| Discoaster surculus, about 15 μm across | |
Scientific classification  | |
| Domain: | Eukaryota |
| Division: | Haptophyta |
| Class: | Prymnesiophyceae |
| Order: | †Discoasterales |
| Family: | †Discoasteraceae |
| Genus: | †Discoaster S.H. Tan, 1931 |
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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 age. Discoaster belongs to the haptophytes. About 100 species can be recognized.