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Mormyridae
(redirected from Mormyrids)

   Also found in: Wikipedia 0.01 sec.
Mormyridae [mȯr′mirĀ·ə‚dē]
(vertebrate zoology)
A large family of electrogenic fishes belonging to the Osteoglossiformes; African river and lake fishes characterized by small eyes, a slim caudal peduncle, and approximately equal dorsal and anal fins in most.

Mormyridae 

a family of fish of the order Mormyriformes. The body measures up to 1.5 m long. The snout is extended in a tube and is sometimes bent downward, enabling the fish to extract from the soil the invertebrates on which it feeds. Mormyrs live in fresh bodies of water in Africa. There are several genera (such as Mormyrus and Gnathonemus), comprising more than 30 species. Some representatives of the genus Mormyrus have electric organs on the sides of their tails, which serve for signaling (impulses are sent with different frequencies and received by other individuals). Mormyrs have commercial value.



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In the coevolving brain and sensory systems of certain electric fish (the mormyrids, for example), part of the cerebellum has been enormously expanded; while these fish utilize two different brain pathways for electrolocation and communication, each with different receptor types, other electric fish, such as the gymnotids, use a single anatomically distinct receptor for both purposes.
[FIGURE 3 ILLUSTRATION OMITTED] The closest occurrence of mormyrids is in the northern KwaZulu-Natal Province of South Africa (Skelton 1993: 92), some 200 km away from Ladybrand.
 
 
 
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