Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Division Selachii Order †Ichthyotomi (Cope) Family †Chondrenchelyidae Jordan, 1923 [monotypic] Genus †Chondrenchelys Traquair, 1888