The Order
Osteoglossiformes
contains these Families:
57. Osteoglossidae [osteoglossids or bonytongues]
58. Pantodontidae [butterflyfish]
59. Hiodontidae [mooneyes]
60. Notopteridae [featherfin knifefishes or Old World knif]
61. Mormyridae [elephantfishes]
62. Gymnarchidae [gymnarchids]