Synonyms for gymnotidae or Related words with gymnotidae
Examples of "gymnotidae"
The naked-back knifefishes are a family (
) of knifefishes found only in fresh waters of Central America and South America. All have organs adapted to the exploitation of bioelectricity. The family has 40 valid species in two genera.
The species is so unusual that it has been reclassified several times. Originally, it was given its own family, Electrophoridae, which was later merged into the genus of
, alongside "Gymnotus".
In 1911 he headed the Gimbel exploration into the regions of the headwaters of the Amazon River. Under the joint auspices of Indiana University and the Carnegie Museum of Natural History this expedition made valuable biological discoveries about the
eels and fish of the region. These discoveries were chronicled in his paper "Gymnotid Eels of Tropical America" which was published in 1913.
Gymnotiform fishes inhabit freshwater rivers and streams throughout the humid Neotropics, ranging from Guatemala to northern Argentina. They are nocturnal fishes. The families
and Hypopomidae are most diverse (numbers of species) and abundant (numbers of individuals) in small nonfloodplain streams and rivers, and in floodplain "floating meadows" of aquatic macrophytes (e.g., "Eichornium", the Amazonian water hyacinth). Apteronotidae and Sternopygidae are most diverse and abundant in large rivers. Species of Rhamphichthyidae are moderately diverse in all these habitat types.
Gymnotiformes and Mormyridae have developed their electric organs and electrosensory systems (ESSs) through convergent evolution. As Arnegard et al. (2005) and Albert and Crampton (2005) show, their last common ancestor was roughly 140 to 208 Mya, and at this time they did not possess ESSs. Each species of "Mormyrus" (family: Mormyridae) and "Gymnotus" (family:
) have evolved a completely unique waveform that allows the individual fish to identify between species, genders, individuals and even between mates with better fitness levels. The differences include the direction of the initial phase of the wave (positive or negative, which correlates to the direction of the current through the electrocytes in the electric organ), the amplitude of the wave, the frequency of the wave, and the number of phases of the wave.
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