Sand Dollar Anatomy: The Petaloid Pattern and Test Structure #112220 (License: Personal Use)

This detailed black-and-white illustration depicts the dorsal (upper) surface of a sand dollar’s test (skeleton), showcasing its characteristic five-part petaloid pattern formed by tube feet pores. The surrounding mesh-like lattice represents the porous, interlocking plates of the echinoderm’s endoskeleton, which provide structural support while allowing movement and respiration. The image captures both biological accuracy and vintage scientific illustration style.

Used in educational resources, marine biology textbooks, museum exhibits, or nature blogs to explain echinoderm morphology; targets students, educators, and beachcombers seeking to identify or understand sand dollar anatomy.