Sea Urchin Anatomy - Spines, Tube Feet, and Test Structure #3807652 (License: Personal Use)

This detailed illustration depicts the oral view of a sea urchin, highlighting its spherical calcareous test covered in sharp red spines and numerous brown-tipped tube feet used for locomotion and feeding. The central mouth opening (peristome) is visible, surrounded by a patterned array of ambulacral and interambulacral areas. The image emphasizes the organism’s pentaradial symmetry and functional morphology.

Used in marine biology educational resources, textbooks, or museum exhibits to explain echinoderm anatomy; matches user intent for learning about sea urchin structure, classification, or adaptation.