Astropecten articulatus, 18 August 2013

Astropecten articulatus, the Royal starfish (aka the Flat sea star);
Volusia county, Florida (18 August 2013).
Learn more about this species at iNaturalist.org.

A close up of this Royal starfish’s madreporite (also known as a sieve plate), essentially the intake valve to draw and filter water into the starfish’s vascular system. 

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