Mammoth Spring Crayfish
This is a reddish-brown crayfish with broad, powerful pincers. The pincers have numerous blackish specks on their basal parts. The abdomen is dark rust-red without specks. The carapace is light tan, with a dark brown band crossing the back of the head and another at the junction of the carapace and abdomen. This crayfish bears a striking resemblance to the Ozark crayfish, and both species occur in the Warm Fork. Males of the two species are easily distinguished by the shape of the reproductive structures (gonopods). The gonopod tips are long and slender in the Ozark crayfish, short and blunt in the Mammoth Spring crayfish. The Ozark crayfish is lighter tan and less reddish, especially on the pincers.