Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Division Selachii Order Tectospondyli Suborder Squaloidei Müller & Henle, 1838 see Order Squaliformes Compagno, 1973 Family Scymnorhinidae see Family Dalatiidae Gray, 1851