By Heiko Bleher The family of Elephant fishes Mormyridae consists of 194 or 195 valid species. They belong to the order Osteoglossiformes, together with the arowanas (Osteoglossidae), the pirarucu (Arapaimidae), butterlyfishes (Chaetodontidae), mooneyes (Hiodontidae), knifefishes (Notopteridae) and the aba aba (Gymnarchidae). Some authors still keep the Elephant fish family in its own order, Mormyriformes, along [...]