This large, colorful crayfish is characterized by very long, slender, blue-green pincers that are studded with prominent yellowish knobs. The carapace and abdomen are olive-tan trimmed with bright red. This is the largest crayfish in Missouri. The long, blue-green pincers and large size distinguish this crayfish from other species within its range. The superficially similar spothanded crayfish has a conspicuous spot on each pincer at the base of the movable finger.