Notopteroidei
Encyclopedia
Notopteroidei is a sub-order of the group Osteoglossiformes
that contains the Notopteridae
(feather backs and knifefish) and mormyrids
(the elephantfishes) as well as extinct families.
Osteoglossiformes
Osteoglossiformes is a relatively primitive order of ray-finned fish that contains two sub-orders, the Osteoglossoidei and the Notopteroidei. All of the living species inhabit freshwater...
that contains the Notopteridae
Notopteridae
The family Notopteridae contains eight species of osteoglossiform fishes, commonly known as featherbacks and knifefishes. They are small fishes living in freshwater or brackish environments in Africa and South-east Asia....
(feather backs and knifefish) and mormyrids
Mormyridae
The family Mormyridae, sometimes called "elephantfish" , are freshwater fish in the order Osteoglossiformes native to Africa. It is by far the largest family in the order with around 200 species. Members of the family are popular, if challenging, aquarium species...
(the elephantfishes) as well as extinct families.