Development of electric organs of <i>Gymnarchus niloticus (Fam. Gymnarchidae)</i>: I. Origin and histogenesis of electroplates

Srivastava, C. B.; Szabo, Thomas L.

doi:10.1002/jmor.1051380305

“…Our observation of wellorganized striations at the more caudal region of the EO contrasts with its absence at the rostral regions, suggesting that there is a rostro-caudal progress of EO development. The A. C. Pereira and others finding of striations in electrocytes was reported previously (Baillet-Derbin, 1978;Srivastava and Baillet-Derbin, 1973;Srivastava and Szabo, 1972;Denizot et al, 1982), even in adults, indicating the myogenic origin of electrocytes. In addition, the reappearance of sarcomeric structures after nerve section Zakon and Ungez, 1999) indicates the role of electromotor neuron innervation on the induction of mature electrocyte features.…”

Section: Discussionsupporting

confidence: 74%

Post-natal development of the electromotor system in a pulse gymnotid electric fish

Pereira

¹

,

Rodríguez-Cattáneo

²

,

Castelló

³

et al. 2007

Journal of Experimental Biology

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“…In both genera the exact location and the embryological origin of electric organs still has yet to be discovered (Baron et al, 1994b(Baron et al, , 1996b. In Mormyriformes, electrocytes are associated with the caudal peduncule musculature in mormyrids, and are modified from tail muscles in Gymnarchus Cuvier (Dahlgren, 1914;Srivastava & Szabo, 1972). In most gymnotiforms as well as in the siluriform Malapterurus, electric organs are derived from trunk or hypaxial musculature (Johnels, 1956;Bennett, 1971a;Kirschbaum, 1977Kirschbaum, , 1983.…”

Section: Phylogenetic Occurrence Of Electric Organs In Teleostsmentioning

confidence: 99%

The evolution of electroreception and bioelectrogenesis in teleost fish: a phylogenetic perspective

Alves-Gomes

¹

2001

Journal of Fish Biology

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According to current phylogenetic theory, both electroreceptors and electric organs evolved multiple times throughout the evolution of teleosts. Two basic types of electroreceptors have been described: ampullary and tuberous electroreceptors. Ampullary-type electroreceptors appeared once in the common ancestor of the Siluriformes+Gymnotiformes (within the superorder Ostariophysi), and on two other occasions within the superorder Osteoglossomorpha: in the African Mormyriformes and in the African Notopteriformes. Tuberous receptors are assumed to have evolved three times; all within groups that already possessed ampullary receptors. With the exception of a single catfish species, for which studies are still lacking, all fish with tuberous electroreceptors also have an electric organ. Tuberous electroreceptors are found in the two unrelated electrogenic teleost lineages (orders Gymnotiformes and Mormyriformes) and in one non-electrogenic South American catfish species (order Siluriformes). Electric organs evolved eight times independently among teleosts: five of them among the ostariophysans (once in the gymnotiform ancestor and in four siluriform lineages), once in the common ancestor of Mormyriformes, and in two uranoscopids. With the exception of two uranoscopid genera, for which no electroreceptive capabilities have been discovered so far, all electric organs evolved as an extension of a pre-existing electroreceptive (ampullary) condition. It is suggested that plesiomorphic electric organ discharges (EODs) possessed a frequency spectrum that fully transgressed the tuning curve of ampullary receptors, i.e. a signal such as a long lasting monophasic pulse. Complex EOD waveforms appeared as a derived condition among electric fish. EODs are under constant evolutionary pressure to develop an ideal compromise between a function that enhances electrolocation and electrocommunication capabilities, and thereby ensures species identity through sexual and behavioural segregation, and minimizes the risk of predation. 2001 The Fisheries Society of the British Isles

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“…In both genera the exact location and the embryological origin of electric organs still has yet to be discovered (Baron et al, 1994b(Baron et al, , 1996b. In Mormyriformes, electrocytes are associated with the caudal peduncule musculature in mormyrids, and are modified from tail muscles in Gymnarchus Cuvier (Dahlgren, 1914;Srivastava & Szabo, 1972). In most gymnotiforms as well as in the siluriform Malapterurus, electric organs are derived from trunk or hypaxial musculature (Johnels, 1956;Bennett, 1971a;Kirschbaum, 1977Kirschbaum, , 1983.…”

Section: Phylogenetic Occurrence Of Electric Organs In Teleostsmentioning

confidence: 99%

The evolution of electroreception and bioelectrogenesis in teleost fish: a phylogenetic perspective

Alves-Gomes

¹

2001

Journal of Fish Biology

View full text Add to dashboard Cite

According to current phylogenetic theory, both electroreceptors and electric organs evolved multiple times throughout the evolution of teleosts. Two basic types of electroreceptors have been described: ampullary and tuberous electroreceptors. Ampullary-type electroreceptors appeared once in the common ancestor of the Siluriformes+Gymnotiformes (within the superorder Ostariophysi), and on two other occasions within the superorder Osteoglossomorpha: in the African Mormyriformes and in the African Notopteriformes. Tuberous receptors are assumed to have evolved three times; all within groups that already possessed ampullary receptors. With the exception of a single catfish species, for which studies are still lacking, all fish with tuberous electroreceptors also have an electric organ. Tuberous electroreceptors are found in the two unrelated electrogenic teleost lineages (orders Gymnotiformes and Mormyriformes) and in one non-electrogenic South American catfish species (order Siluriformes). Electric organs evolved eight times independently among teleosts: five of them among the ostariophysans (once in the gymnotiform ancestor and in four siluriform lineages), once in the common ancestor of Mormyriformes, and in two uranoscopids. With the exception of two uranoscopid genera, for which no electroreceptive capabilities have been discovered so far, all electric organs evolved as an extension of a pre-existing electroreceptive (ampullary) condition. It is suggested that plesiomorphic electric organ discharges (EODs) possessed a frequency spectrum that fully transgressed the tuning curve of ampullary receptors, i.e. a signal such as a long lasting monophasic pulse. Complex EOD waveforms appeared as a derived condition among electric fish. EODs are under constant evolutionary pressure to develop an ideal compromise between a function that enhances electrolocation and electrocommunication capabilities, and thereby ensures species identity through sexual and behavioural segregation, and minimizes the risk of predation. 2001 The Fisheries Society of the British Isles

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Development of electric organs of Gymnarchus niloticus (Fam. Gymnarchidae): I. Origin and histogenesis of electroplates

Cited by 12 publications

References 7 publications

Post-natal development of the electromotor system in a pulse gymnotid electric fish

Post-natal development of the electromotor system in a pulse gymnotid electric fish

The evolution of electroreception and bioelectrogenesis in teleost fish: a phylogenetic perspective

The evolution of electroreception and bioelectrogenesis in teleost fish: a phylogenetic perspective

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