Echinoid fossils are the remains of ancient sea urchins, a type of echinoderm, that have been preserved in the fossil record.
Echinoid fossils are recognized by their spherical or disc-shaped shells, which are covered in spines (depending on their preservation!) and have a distinctive five-fold symmetry.
Echinoid fossils are important indicators of past marine environments and can provide insights into the evolution and diversity of life on Earth.
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