Notopteroidei
Campylomormyrus tamandua
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Osteoglossiformes
Suborder:	Notopteroidei Jordan, 1923
Subgroups[1][2][3]
†Laeliichthys †Lopadichthys †Ostariostoma †Palaeonotopterus †Sinoglossus? Notopteridae (featherfin knives) Mormyroidea Gymnarchidae (aba) Mormyridae (elephantfishes)

Notopteroidei is a suborder of the order Osteoglossiformes that contains the extant families Gymnarchidae (aba), Notopteridae (feather backs and knifefish) and Mormyridae (elephantfishes), as well as several extinct taxa. The Mormyridae are weakly electric fishes, able to locate prey in turbid water.^[1][2][3]

v t e Osteoglossomorpha
Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Subclass: Neopterygii Infraclass: Teleostei Actinopterygii see Actinopterygii Neopterygii see Neopterygii Teleostei see Teleostei Osteoglossomorpha see below↓ Osteoglossomorpha
Osteoglossomorpha †Chandlerichthys †Coriops †Harenaichthys †Jinanichthys †Paralycoptera? †Tanolepis? †Tongxinichthys †Xixiaichthys †Huashiidae Huashia Kuntulunia †Lycopteridae Jiuquanichthys Kokuraichthys? Kuyangichthys Lycoptera Hiodontiformes Hiodon †Jiaohichthys †Kokuraichthys? †Plesiolycoptera †Yanbiania Osteoglossiformes †Archaeglossus †Furichthys †Joffrichthys †Kokenichthys †Shuleichthys †Tetoriichthys †Thaumaturus †Wakinoichthys †Wilsonichthys †Xixiaichthys? Pantodontidae †Capassopiscis †Cretapantodon †Palaeopantodon †Pankowskipiscis Pantodon †Petersichthys †Prognathoglossum Osteoglossidae sensu lato †Chanopsis †Chauliopareion †Singida †Phareodontinae Brychaetoides Brychaetus Cretophareodus Magnigena Monopteros Musperia Phareodus Phareodusichthys Phareoides Ridewoodichthys Taverneichthys Xosteoglossid Arapaiminae Arapaima Heterotis †Joffrichthys? †Sinoglossus? †Thrissopterus Osteoglossinae †Foreyichthys †Heterosteoglossum †Opsithrissops Osteoglossum Scleropages Notopteroidei Gymnarchus †Laeliichthys †Lopadichthys? †Ostariostoma? †Palaeonotopterus †Sinoglossus? Notopteridae Chitala Notopterus Papyrocranus Xenomystus Mormyridae Petrocephalus Mormyrinae Boulengeromyrus Brevimyrus Brienomyrus Campylomormyrus Cryptomyrus Cyphomyrus Genyomyrus Gnathonemus Heteromormyrus Hippopotamyrus Hyperopisus Isichthys Ivindomyrus Marcusenius Mormyrops Mormyrus Myomyrus Paramormyrops Pollimyrus Stomatorhinus