Stomatorhinus

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Stomatorhinus
Stomatorhinus walkeri

Stomatorhinus walkeri

Systematics
Overcohort : Osteoglossomorpha (Osteoglossomorpha)
Order : Bony tongues (Osteoglossiformes)
Subordination : Knifefish-like (Notopteroidei)
Family : Nilhechte (Mormyridae)
Subfamily : Mormyrinae
Genre : Stomatorhinus
Scientific name
Stomatorhinus
Boulenger , 1898

Stomatorhinus is a genus of African freshwater fish from the Nilhechte family(Mormyridae). Most species of the genus occur in the Congo Basin , others in Gabon and Cameroon .

features

Stomatorhinus species are five to eleven centimeters long and are among the smallest Nile pike. Your body is short or slightly elongated. The greatest body height is between the base of the pelvic fin and the base of the anal fin. The pelvic fins are closer to the pectoral fins than to the anal fin. The dorsal fin is only slightly shorter than the anal fin, it has one or two simple fin rays in front of the branched fin rays, but this can only be seen in the X-ray image .

It is typical of the species that the front and rear nostrils on each side of the head are close together near the mouth opening, but the nostrils on both sides of the head are far apart. In all other Nilhechte, the nostrils are located away from the mouth opening. The teeth, 7 to 10 in the upper jaw and 8 to 10 in the lower jaw, are two-pointed. The lower jaw is not thickened.

Like all Nilhechte, Stomatorhinus species are capable of electrical communication and electrical orientation. The area of ​​the brain assigned to the perception of electrical fields consists of two parts on each side of the brain, in contrast to three separate areas in all other Nile pike.

The fish are inconspicuous, mostly monochrome grayish or brownish in color.

species

The genus includes 13 species:

literature

  • Melanie Stiassny, Guy Teugels & Carl D. Hopkins: The Fresh and Brackish Water Fishes of Lower Guinea, West-Central Africa, Volume 1. ISBN 9789074752206

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