Sand Dollar Anatomy Diagram - Marine Biology Educational Illustration #3878338 (License: Personal Use)

This hand-drawn illustration depicts the aboral (upper) side of a sand dollar test, featuring the characteristic five-petaled petaloid structure formed by rows of tiny pore pairs used for respiration and locomotion. The irregular, scalloped edge represents the peristome margin, while the central star-like pattern reflects the underlying Aristotle’s lantern and radial canal system. The image uses clean linework to emphasize morphological features without shading or color distraction.

Used in educational contexts such as marine biology textbooks, museum exhibits, K-12 science curricula, and online identification resources; serves users seeking to understand echinoderm anatomy or identify beachcombed specimens.