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The retina is called a "grouped retina", an eye structure seen in mormyrids and a few other fishes. [6] Instead of being smooth, their retina is composed of tiny cups, acting like parabolic mirrors. Because of the murky waters they inhabit, the cones in their eyes have adapted to see only red light.
The global status of mormyrids and gymnarchids is unclear, since there are accurate and systematic data only for the North African region, where the extinction rate of the former taxon in 2011 is estimated at 44.4% with 55.6% of individuals in danger, [15] while for the latter, the IUCN recommends greater efforts to census its population and ...
Mormyrus longirostris, commonly referred as the eastern bottle-nosed mormyrid, is a medium-sized ray-finned fish species belonging to the family Mormyridae.It was originally described by Wilhelm Peters in Monatsberichte der Akad. Wiss. Berlin, 1852.
Bronze figurine of Oxyrhynchus fish, Late Period-Ptolemaic Egypt The Medjed was a sacred fish in Ancient Egypt. At the city of Per-Medjed, better known as Oxyrhynchus, whose name means "sharp-nosed" after the fish, archaeologists have found fishes depicted as bronze figurines, mural paintings, or wooden coffins in the shape of fishes with downturned snouts, with horned sun-disc crowns like ...
Peters's elephant-nose fish (Gnathonemus petersii) is an African freshwater elephantfish in the genus Gnathonemus.Other names in English include elephantnose fish, long-nosed elephant fish, and Ubangi mormyrid, after the Ubangi River.
The Cornish jack, Mormyrops anguilloides, is a species of weakly electric fish in the family Mormyridae, native to quiet waters in much of Sub-Saharan Africa.The largest species in its family, the Cornish jack is a nocturnal group hunter of smaller fishes, using electricity to locate its prey and communicate with other members of its group.
A knollenorgan drawn by the German anatomist Viktor Franz, 1921. RC=receptor cell; b.m.= basal membrane; n=nerve. Line at top=skin surface. [1]The organ is embedded in the skin of mormyrid fishes, which actively electrolocate by generating brief electrical pulses with their electric organ.
Mormyrops is a genus of weakly electric fish in the family Mormyridae from freshwater in Africa. They are characterized by an elongate head measuring twice as long as high, and no teeth on the palate or the tongue. [1]