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Astropecten Sea Star
Honestly I have no idea exactly what species of sea star this is, other than it is a member of the genus Astropecten, of which there are over 100 members! They can be difficult to tell apart. But if you happen to be a starfish expert and you recognize this guy, let me know!
Photo, near Garden Key in the Dry Tortugas National Park, Florida Keys, USA.