description Micraster glyphus Overview
Micraster glyphus is an extinct irregular sea urchin from the genus Micraster, a group commonly represented in Late Cretaceous chalk deposits of Europe. Its fossil test is heart-shaped, with a front-to-back axis and petal-like ambulacra that reflect the animal's bilateral organization. Like other irregular echinoids, Micraster species were adapted to living on or within soft marine sediment rather than on exposed rocky surfaces.
help Micraster glyphus FAQ
What is Micraster glyphus?
Micraster glyphus is an extinct irregular sea urchin in the genus Micraster. Its fossils are associated with Late Cretaceous chalk deposits in Europe.
What shape is a Micraster glyphus fossil?
Its fossil test is heart-shaped, with a clear front-to-back axis. The petal-like ambulacra show the bilateral organization typical of irregular sea urchins.
What are ambulacra on a Micraster fossil?
Ambulacra are the patterned regions on a sea-urchin test that contain the animal’s tube-foot openings. In Micraster glyphus, these areas create the visible petal-like markings on the fossil.
When did Micraster glyphus live?
Micraster glyphus lived during the Late Cretaceous, when chalk was being deposited widely across parts of Europe. It is known from fossils rather than from any living population today.
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