[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977 Order Squaliformes Compagno, 1973 - dogfish sharks Family Squalidae Blainville, 1816 - dogfish sharks Genus Isistius Gill, 1865 Isistius plutodus Garrick & Springer, 1964 - largetooth cookiecutter shark