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Chris Mah @echinoblog.bsky.social · 16/06/2025

Stunning urchin tests by Anders Hallan via National Geographic www.facebook.com/natgeo/posts...

Purple urchin with smooth plates on top, blunt fringe around edge

spiny urchin with spines on spines

red urchin skeleton with white highlights

elongate spines with red/white bands on white center test