Marcusenius moorii

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Marcusenius moorii
MormyrusLepturusFord.jpg

Marcusenius moorii

Systematics
Order : Bony tongues (Osteoglossiformes)
Subordination : Knifefish-like (Notopteroidei)
Family : Nilhechte (Mormyridae)
Subfamily : Mormyrinae
Genre : Marcusenius
Type : Marcusenius moorii
Scientific name
Marcusenius moorii
( Günther , 1867)

Marcusenius moorii is an African freshwater fish from the Nilhechte family(Mormyridae). It occurs in the lower and central Congo , in the Ogowe , Kouilou / Niari and Sanaga in the Democratic Republic of the Congo , the Republic of the Congo , Gabon and Cameroon .

features

Marcusenius moorii becomes a maximum of 21.4 cm long and has a typical Nilhecht form with a moderately high body, the height of which reaches 26.6 to 32.8% of the standard length . The head length is 24.1 to 28% of the standard length, it is 1.1 to 1.3 times longer than high. The snout is blunt and reaches 24.5 to 28.6% of the head length. The mouth is terminal, the thick lower jaw protrudes. The teeth, five in the upper jaw and six in the lower jaw, are double-pointed. The eyes are small, their diameter is 12.9 to 15.6% of the length of the head.

The dorsal and anal fins are located far back, just before the long tail fin stalk. The former reaches a length of 18.5 to 20% of the standard length and is supported by 17 to 26 fin rays ( median = 24), the longer anal fin (23 to 26% of the standard length) by 24 to 33 rays (median = 30). The pectoral fins are twice as long as the pelvic fins and reach behind the pelvic fin base. 37 to 45 scales are counted along the sideline and eight around the tail fin stalk. There are 14 to 20 rows of scales between the dorsal and anal fin. The tail fin stalk is 2.3 to 3.1 times as long as it is high and reaches a length of 15.8 to 18.9% of the standard length. The caudal fin is forked with rounded tips.

The fish are reddish-gray in color, with a dark brown transverse band that extends between the first 5 to 10 rays of the dorsal and anal fin.

Like all Nilhechte, Marcusenius moorii is capable of electrical communication and electrical orientation. Its electrical signal is simple, has a biphasic waveform, and lasts approximately 0.39 milliseconds in females and fry and 0.75 milliseconds in adult males.

literature

  • Melanie Stiassny, Guy Teugels & Carl D. Hopkins: The Fresh and Brackish Water Fishes of Lower Guinea, West-Central Africa, Volume 1. ISBN 9789074752206
  • ACLG Günther: New fishes from the Gaboon and Gold Coast. Annals and Magazine of Natural History (Series 3), Volume 20, Issue 116, Pages 110–117, 08/1867 Link to the first description (PDF; 4.2 MB)

Web links