Snout short, broadtipped, and obtusely pointed, its lateral margins largely convex; disc flattened centrally, length 1.2 times its width; orbit very small, its diameter 6.5 in preorbital length; tail long, 1.4–1.6 in disc length; skin rough, covered with small denticles; juveniles with preorbital, scapular and middorsal band of thorns on back; no distinct series of thorns or spines in adults. Body colour adults light brown (juveniles dark grey) dorsally, except for large traslucent area on snout to each side of rostral cartilages; whitish below.