Sold individually  The Florida Keyhole Sand Dollar (Mellita isometra) is a species of echinoderm found in the sandy, shallow coastal waters of the southeastern United States, particularly around Florida. Characterized by its flattened, disk-like shape and distinct keyhole-shaped openings, this sand dollar is part of the order Clypeasteroida. The keyhole openings are thought to aid in the animal's burrowing and respiration. Covered in tiny, velvety spines that help with movement and feeding, Florida Keyhole Sand Dollars primarily consume microscopic algae and detritus. These creatures play a crucial role in the ecosystem by contributing to the nutrient cycle and serving as prey for various marine animals. When alive, they appear dark or greyish in color, but their skeletons, called tests, often bleach white when washed ashore after death. All sea specimens and shells vary slightly in size and shape. You will receive a high quality specimen of the selected item but not the exact one pictured.