Species: Rhinobatos spinosus, Spiny guitarfish

Rhinobatos spinosus Gunther, 1870

Spiny guitarfish

Body shark-like; head and adjoining pectoral fins forming a distinctly elongate triangular structure; snout relatively long, its 2 cartilage ridges very narrow, close together, with a small, short groove at the base; thornlike, back-pointing spines with oval bases along entire length of those cartilages in 2 irregular rows, with smaller spines among and between the larger ones; nostrils without a lateral skin fold, distance between outer angle of nostrils ½ distance between mouth and snout tip, front lobe of nostril very slender; mouth nearly straight;  rear edges of pectoral fins not overlapping front of pelvic fins; two large, triangular, equal-sized dorsal fins; tail fin asymetrical and without a distinct lower lobe, tips rounded; skin covered with small denticles, entire upper surface rough; compressed spines with dilated bases along center of back, on shoulders, and above the eyes and spiracles.