Rhizoprionodon longurio (JORDAN & GILBERT, 1882)
Description after Springer, 1964 [#2274]: Upper teeth 13-1-13 to 15-1-14; lower teeth 13-13 to 14-14 (higher and lower counts usually correlated) ; cusps of some upper teeth in large specimens slightly serrulate; cusps of lower teeth adumbrating this condition; dentition of mature males and females similar; sometimes cusps of teeth of mature males slightly more erect than in females. Denticles imbricate, 3-ridged in young and adults, 3-toothed in young, 3-toothed or irregularly margined in adults.
Material: sex?, TL?, La Paz, Baja California Sur, collection: Jaws International, Gordon Hubbell, Florida
Images: © Ross Robertson, Smithsonian Tropical Research Institute, Panama, images shows the correct position of the teeth 
Material: sex?, 101,5 cm TL, collection: Natural History Museum of Los Angeles County, LACM-39356-1, Mexico, Mazatlan, coll. 1964
Images: © Ross Robertson, Smithsonian Tropical Research Institute, Panama, images shows the correct position of the teeth 
Material: sex?, ? TL, Natural History Museum of Los Angeles County, LACM-39433-12
Images: © Ross Robertson, Smithsonian Tropical Research Institute, Panama, images shows the correct position of the teeth 
