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| Micraster Temporal range: Late Cretaceous-Paleogene
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| Micraster antious Cretaceous (Opakua) | |
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| Genus: | †Micraster Agassiz, 1836
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Micraster is an extinct genus of echinoids from the Late Cretaceous to the early Eocene. Its remains have been found in Africa, Antarctica, Europe, and North America. Micraster was an infaunal echinoid living in a burrow below the sediment surface. The test is clearly bilateral and there is a deep anterior groove to take in water containing organic particles to the mouth. The tube feet keep a supply of nutrient-laden water moving into the burrow. The anus has a waste tube behind it.