What specific physical feature caused one documented Freshwater Polka Dot Stingray to command a record price of $100,000?

Answer

A unique U-shaped head mutation

A staggering price of $100,000 was commanded by a specimen due to a unique genetic mutation resulting in a U-shaped head.

What specific physical feature caused one documented Freshwater Polka Dot Stingray to command a record price of $100,000?
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