description Holaster subglobosus Overview
Holaster subglobosus is an extinct species of heart urchin, a type of irregular echinoid that existed during the Cretaceous period. As a member of the Holaster genus, it possessed bilateral symmetry unlike the more common five-fold symmetry of regular sea urchins. It is commonly found as a fossil preserved in chalk formations. Paleontologists study this marine invertebrate to understand the biodiversity and ecological conditions of prehistoric sea floors.
help Holaster subglobosus FAQ
What is Holaster subglobosus?
Holaster subglobosus is an extinct species of heart urchin and an irregular echinoid. It lived during the Cretaceous period.
How is Holaster subglobosus different from a regular sea urchin?
Holaster subglobosus had bilateral symmetry, while regular sea urchins typically show five-fold radial symmetry. Its body plan reflects the burrowing, irregular-urchin group rather than the familiar round shape of many living urchins.
Why is Holaster subglobosus called a heart urchin?
Heart urchin is the common name for irregular echinoids with a distinctive bilateral body form. Holaster subglobosus belongs to the genus Holaster and has the characteristic anatomy of that fossil group.
When did Holaster subglobosus live?
Holaster subglobosus lived during the Cretaceous period, long before modern humans appeared. It is known as a fossil species rather than a living sea urchin.
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