CLEVELAND, Ohio – On a recent September morning, Sean Williams took his Tri-C biology class to the Chagrin River to look for invertebrates, such as crayfish, flatworms and insect larvae.

What they came across shocked Williams.

One of his students, Maykala Hooper, spotted what she believed to be a crayfish lurking in about one foot of water.

Williams went over to check it out and with the help of another student, pulled aside a rock the size of a table to expose the crustacean.

But there was something peculiar about the crayfish. One half was brown and the other half orange, with a clear demarcation down the middle.

“Out of instinct I reached down and grabbed it,” Williams said “… and I was freaking out.”

That’s because Williams knew what he had – a crayfish with a bilateral color var

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