Species: Carcharhinus brevipinna, Spinner shark

Carcharhinus brevipinna (Müller & Henle, 1839)

Spinner shark

A slender shark; eyes round, small, nictitating lower eyelid present; snout narrowly pointed, long, distance from tip to front of nostrils > distance from front of mouth to front of nostrils; anterior nasal flap very reduced and low; top and bottom teeth very similar, nearly symmetrical, with long narrow, straight points, top teeth finely serrated (in adults), lower teeth smooth; top lip furrow long, prominent; five gill slits, moderately long, last two over pectoral fin, gill arches without papillae; two dorsal fins, first relatively small, 5-6 times higher than second, its origin over or just behind free rear tip of pectoral; 2nd dorsal fin with length of free rear tip 1.5 X height of that fin;  origin of second dorsal almost directly over anal fin origin; pectorals relatively small, narrow, curved, sharp tips; no ridge on body between dorsal fins; tail base without keel; tail fin strongly asymmetrical, with well developed lower lobe, undulating ridge along dorsal surface of top lobe, and a notch under tip of that lobe.