Knifefish-like

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Knifefish-like
Thousand dollar fish (Chitala ornata)

Thousand dollar fish ( Chitala ornata )

Systematics
Class : Ray fins (Actinopterygii)
Subclass : Neuflosser (Neopterygii)
Subclass : Real bony fish (Teleostei)
Overcohort : Osteoglossomorpha (Osteoglossomorpha)
Order : Bony tongues (Osteoglossiformes)
Subordination : Knifefish-like
Scientific name
Notopteroidei
Greenwood , 1973

The knifefish-like (Notopteroidei) are a subordination of the bone-like fish (Osteoglossiformes). The suborder includes about 225 species of freshwater fish . The vast majority of the species live in tropical Africa, seven in South Asia.

features

The knifefish-like have a connection between the swim bladder and the inner ear, which is formed by a bulge at the front end of the swim bladder and which extends to the organ of equilibrium (sacculus). This leads to exceptionally good hearing. Other similarities exist in the structure of the gill skeleton and in the muscles of the hyoid bone (hyoid).

Internal system

The subordination is divided into three families. Ten species belong to the Old World knifefish, about 215 to the Nile pike and elephant fish, and the Greater Nile pike is the only species of the monotypical family Gymnarchidae. The last two families are combined into one superfamily, the Mormyroidea. A common feature of the Mormyroidea is an electrical organ in the tail stalk, consisting of converted muscle cells, which is used for electrical orientation and communication.

literature