[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
   Order Carcharhiniformes Compagno, 1973 - ground sharks
     Family Triakidae Gray, 1851 - houndsharks
       Genus Iago Compagno & Springer, 1971
         1 Iago garricki Fourmanoir & Rivaton, 1979 - llongnose houndshark
         2 Iago omanensis (Norman, 1939) - bigeye houndshark