Sand Dollar Anatomy Diagram - Marine Biology Illustration #1964858 (License: Personal Use)

This black-and-white line illustration depicts the upper (aboral) surface of a sand dollar, showcasing its characteristic five-petaled “flower” pattern formed by ambulacral grooves. The central madreporite is clearly visible, surrounded by delicate radiating lines representing the tube feet channels. The irregular oval outline reflects the natural shape of the echinoderm’s calcareous test.

Used in marine biology textbooks, educational websites, and museum exhibits to teach echinoderm anatomy; supports user intent for species identification, classroom learning, or scientific illustration reference.