The underside of a Pacific Sand Dollar (Dendraster excentricus), showing the amazing food grooves leading to the mouth (close to the center of the sand dollar).
The grooves look like tree branches or tributaries:
You can also see the tiny white knobs that the sand dollar's spines would be attached to when alive:
One more, showing a close-up of the convergence of the food grooves at the mouth:
Photographed in Crescent City, CA, on 27 October 2022.
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