Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Order Carcharhiniformes Compagno, 1973 - ground sharks Family Carcharhinidae Jordan & Evermann, 1896 - requiem sharks Genus Rhizoprionodon Whitley, 1929 Rhizoprionodon acutus (Rüppell, 1837) - grey dog shark