Fishes Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Order Rajiformes Berg, 1940 - skates Family Rhinobatidae Müller & Henle, 1838 - guitarfishes 1 Subfamily Rhinobatinae 2 Subfamily Rhynchobatinae 3 Subfamily Rhininae 4 Subfamily Platyrhininae - thornbacks see Family Platyrhinidae Jordan, 1923