Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Division Selachii Order Euselachii Hay, 1902 see Subclass Euselachii Hay, 1902 Suborder Galei see Superorder Galeomorphi Compagno, 1973 Family Pentanchidae Smith, 1912 - deepwater catsharks