Notopteroidei

One thousand U.S. dollars fish ( Chitala ornata )

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

Features

The knife -like fish have a connection between the swim bladder and the inner ear, which is formed by a ballooning of the front end of the swim bladder and to the vestibular system ( saccule ) is sufficient. This results in an exceptionally good hearing. Other similarities exist in the construction of the gill skeleton and the muscles of the hyoid bone ( hyoid ).

Inside systematics

The submissions will be divided into three families. Among the Old World knife fish include ten species to the Nilhechten and elephant fish about 215 and the Großnilhecht is the only way to so monotypic family Gymnarchidae. The last two families are summarized to a superfamily that Mormyroidea. A common feature of Mormyroidea is composed of muscle cells converted electric organ in the tail stem, which serves the electrical orientation and communication.

• Subordination knife fish like ( Notopteroidei ) Family Old World knife fish ( Notopteridae )
• Superfamily Mormyroidea Family mormyrids and elephant fish ( Mormyridae )
• Family Großnilhecht ( Gymnarchidae )