1.5" Cretaceous Sea Urchin (Macraster) Fossil - Texas
This is a fossil sea urchin of the species Macraster roberti var. ovatus, collected from the Duck Creek Formation of Grayson 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.