How to distinguish noble crayfish from signal crayfish

Noble Crayfish

• On the noble crayfish, you will find a row of small spines along the boundary between the head and the carapace (A). Feel with your finger!
• The noble crayfish has dark, uniform claws with dark "thumb grips," often with a signal red wart (B).
• The claws are long and almond-shaped with numerous warts and spiny projections.
• The head and carapace are dark, often blackish, with warts and spiny projections.

Signal Crayfish

• The signal crayfish has no spines along the boundary between the head and the carapace (A). Feel with your finger!
• The claws are often lighter on the underside. A white wart in the "thumb grip," usually surrounded by a large white-turquoise spot (B).
• The claws are broad, "muscular," and the surface is smoother with recessed pores.
• The head and carapace are smooth with recessed pores. Often a clearly brownish color tone.