1.8" Cretaceous Sea Urchin (Palhemiaster) Fossil - Texas
This is a Early Cretaceous fossil sea urchin (Palhemiaster comanchei) fossil from the Comanche Peak Formation of Coryell County, Texas.
Sea urchins are a type of echinoderm which are still living relatively unchanged today. They live at the bottom of soft ocean floors and have long spines protruding from their central body. They move along the bottom of the ocean using many small feet while feeding on various plant and animal matter.