Isurus paucus

Porbeagle Lamna nasus

White Shark Carcharodon carcharias

Shortfin Mako
Isurus oxyrinchus

Porbeagle Lamna nasus. Teeth with small side cusplets (except in specimens less than 1 m). Origin of second dorsal fin above that of anal fin. Caudal fin with a small but strong secondary keel below the rear end of the primary keel. Free rear tip of first dorsal fin abruptly white.

White Shark Carcharodon carcharias. Teeth without side cusplets (except in specimens less than 2 to 3 m which always have serrations on some teeth). Upper teeth triangular with serrated edges. Origin of first dorsal fin opposite or slightly anterior to inner corners of pectoral fins when the latter are laid back. Origin of second dorsal fin in advance of anal-fin origin. Caudal fin without a secondary keel. Free rear tip of first dorsal fin not abruptly white. Anal-fin origin posterior to second dorsal-fin base.

Shortfin Mako Isurus oxyrinchus. Teeth without side cusplets. Upper teeth with smooth-edged cusps. Cusps of upper and lower anterior teeth recurved at bases but with tips reversed and curving outward. Origin of first dorsal fin posterior to inner corners of pectoral fins when the latter are laid back. Origin of second dorsal fin in advance of anal-fin origin. Free rear tip of first dorsal fin not abruptly white. Caudal fin without a secondary keel. Pectoral fins considerably shorter than head, relatively narrow-tipped in young, acutely pointed in adults. Origin of anal fin about under midbase of second dorsal fin. Snout usually acutely pointed. Underside of snout and mouth white in adults and subadults.