Rhizoprionodon lalandii (MÜLLER & HENLE, 1839)
Material: male, 85 cm TL, collection: Jaws International, Gordon Hubbell, Florida
Images: © Ross Robertson, Smithsonian Tropical Research Institute, Panama, images shows the correct position of the teeth
Description after Springer, 1964 [#2274]: Upper teeth 12-1-12; lower teeth 11-12 to 12-12 (usually 12-12); cusps of teeth smooth to faintly irregular, posterior margins sometimes denticulate; anterior teeth of lower jaw of mature males distinct from those of females and young males (fig. 11); in mature males cusps of anterior teeth of lower jaw are slenderer and rounder in cross section than in females and young males. This situation is somewhat analagous to, but less striking than, that found in Scoliodon. Denticles imbricate (adults), 3-ridged and 3-toothed in young, 3- to 5-ridged and 3- to 5-toothed or irregularly margined in adults.
Material: female, 68 cm TL, American Museum of Natural History, coll. nr. 510, Trinidad, Port of Spain fish market, coll. 19.08.1987
Images: © Ross Robertson, Smithsonian Tropical Research Institute, Panama, images shows the correct position of the teeth 
