WebApr 19, 2005 · Most mammals hear frequencies well above the range of human hearing, termed ultrasonics. Some also hear well at very low frequencies, even at seismic sounds generated by earthquakes. To study both normal and abnormal hearing, our laboratory has used the scanner to image all parts of the auditory system of more than 30 species of …
[PDF] Seven new species of the Neotropical electric fish Gymnotus ...
WebJan 3, 2001 · The book reviews recent advances in tropical plant breeding. Each of the twenty-four chapters describes a specific crop, which has been written by scientists working in the field of plant breeding and genetic improvement of that particular species. The book will be a useful reference work for professional plant breeders as well as researchers, … WebOct 2, 2024 · Most healthy adults have an average hearing range of between 20 and 20,000 hertz. Sounds below 20 Hz are called infrasound, and those above 20,000 Hz … jds jeu
The diversity and evolution of electric organs in Neotropical ...
WebGymnotiformes(South American knifefishes and electric eels) Class ActinopterygiiOrder GymnotiformesNumber of families 5 Source for information on Gymnotiformes ... WebJun 15, 2015 · Take a moment to sympathise with the turtle, that only has a vocal hearing range of between 20Hz and 1,000Hz. The goldfish doesn’t fare much better, with a … 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. See more The Gymnotiformes /dʒɪmˈnɒtɪfɔːrmiːz/ are an order of teleost bony fishes commonly known as Neotropical knifefish or South American knifefish. They have long bodies and swim using undulations of their elongated See more Most gymnotiforms are weakly electric, capable of active electrolocation but not of delivering shocks. The electric eels, genus Electrophorus, are strongly electric, and are not closely related to the Anguilliformes, the true eels. Their relationships were analysed by … See more Gymnotiformes are among the more derived members of Ostariophysi, a lineage of primary freshwater fishes. The only known fossils are from the Miocene about 7 million … See more Anatomy and locomotion Aside from the electric eel (Electrophorus electricus), Gymnotiformes are slender fish with narrow bodies and tapering tails, hence the common … See more There are currently about 250 valid gymnotiform species in 34 genera and five families, with many additional species yet to be formally described See more Gymnotiform fishes inhabit freshwater rivers and streams throughout the humid Neotropics, ranging from southern Mexico to northern Argentina. They are nocturnal fishes. The families Gymnotidae and Hypopomidae are most diverse (numbers of species) and … See more • Electric fish • Gymnarchus, the African knife-fish (Mormyroidea) See more jdsjis