Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Superclass Pisces Linnaeus, 1758 - fishes Chondrichthyes Huxley, 1880 - cartilaginous fishes Family Carcharhinidae Jordan & Evermann, 1896 - requiem sharks Genus Negaprion Whitley, 1940 Negaprion acutidens (Rüppell, 1837) - sicklefin lemon shark