Crayfish

Freshwater decapod crustacean. Cylindrical Body shape. Cephalotorax conspicuously granular (roughened) in adults, provided of numerous small tuberculi and also having strong cervical, cephalic, branchiostegal, and marginal spines. Rostrum long with margins straight, convergent, having marginal spines near its tip, ending in a triangular acumen. Chelae narrow and long, notch in proximal portion of dactyl, leaving gap and delimited by tubercle. Large tubercle opposite end of gap on fixed finger; large scarlet tubercles on the palm and fingers. Carapace not separated at the middle (dorsally) by a space, the areola. Colour in adults dark red, some in shades of brown. A wedge-shaped black stripe is present on the abdomen. Chelae with bright red tubercles. Juveniles uniform grey, sometimes overlain by dark wavy lines.