Species: Isurus oxyrinchus, Shortfin mako, Shortfin mako shark

Isurus oxyrinchus Rafinesque, 1810

Shortfin mako shark

Body moderately slender; eye relatively small; snout relatively long and sharply pointed; nostrils on side of snout; teeth smooth-edged, long and slender at front of jaws, blade-like and triangular at rear; 5 long gill slits, all before pectoral; a large first dorsal fin, origin over pectoral border; very small second dorsal and anal fins positioned near base of tail fin, origin of anal under middle of 2nd dorsal base; pectoral fins relatively long and narrow, 16-17% TL, less than head length; tail almost symmetrical, semilunar; tail base flattened, with large keel that extends onto tail fin.