Sand Dollar Fossil - Natural Marine Echinoderm Specimen #3867599 (License: Personal Use)

This sand dollar specimen features a classic pentaradial symmetry with finely etched petaloid ambulacral grooves radiating from the center, and five distinct lunules (perforations) along the margin. Its smooth, off-white test shows subtle textural variation and natural wear, indicating it was likely washed ashore after the organism’s death. The structure reflects the internal anatomy of the living echinoderm, including the madreporite at the center.

Used on educational, marine biology, or natural history websites; commonly appears in product listings for beachcombing souvenirs, classroom teaching aids, or paleontology resources. Matches user intent for identification, collection, or learning about marine fossils.