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Unfortunately, pictures are usually not helpful. The native Floridian slough crayfish (Procambarus fallax) and the marbled crayfish (P. virginalis or P. fallax f. virginalis) can't be told apart by their appearance. The only sure way to make sure you have one rather than the other is a DNA test...

Hi! I'm Zen Faulkes, biologist who curates the Marbled Crayfish research site. (Not the commercial site. I don't sell crayfish.) I am here to ask -- no, beg on bended knee that anyone who suspects they might have found marbled crayfish in the wild, please contact me. There has never been a...