2014
DOI: 10.1590/1982-0224-20130189
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Abstract: B chromosomes are extra chromosomes from the normal chromosomal set, found in different organisms, highlighting their presence on the group of fishes. Callichthys callichthys from the upper Paraná River has a diploid number of 56 chromosomes (26 m-sm + 30 st-a) for both sexes, with the presence of a sporadically acrocentric B chromosome. Moreover, one individual presented a diploid number of 57 chromosomes, with the presence of a morphologically ill-defined acrocentric B chromosome in all analyzed cells. The p… Show more

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Cited by 2 publications
(1 citation statement)
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“…Among ray-finned fish, the occurrence of Bs is well documented in approximately 46 different taxa of neotropical fish from the order Characiformes, 28 species of Siluriformes, 19 different taxa of Perciformes, five Cypriniformes, and in a significantly lower number of other fish taxa [1,6]. The highest number of Bs (16) was observed in the cascarudo Callichthys callichthys (Linnaeus, 1758): a freshwater catfish from the family Callichthyidae distributed in South America [8]. Supernumerary chromosomes in fish vary greatly in size: from microchromosomes, such as in streaked prochilod Prochilotus lineatus (Valenciennes, 1837) [9], M. sanctaefilomenae [3], and Amazon molly Poecilia formosa (Girard, 1859) [10], through to medium-sized chromosomes, such as in Rhamdia species [11], to macrochromosomes detected among others in some populations of Astyanax scabripinnis (Jenyns, 1842) [12].…”
Section: Introductionmentioning
confidence: 99%
“…Among ray-finned fish, the occurrence of Bs is well documented in approximately 46 different taxa of neotropical fish from the order Characiformes, 28 species of Siluriformes, 19 different taxa of Perciformes, five Cypriniformes, and in a significantly lower number of other fish taxa [1,6]. The highest number of Bs (16) was observed in the cascarudo Callichthys callichthys (Linnaeus, 1758): a freshwater catfish from the family Callichthyidae distributed in South America [8]. Supernumerary chromosomes in fish vary greatly in size: from microchromosomes, such as in streaked prochilod Prochilotus lineatus (Valenciennes, 1837) [9], M. sanctaefilomenae [3], and Amazon molly Poecilia formosa (Girard, 1859) [10], through to medium-sized chromosomes, such as in Rhamdia species [11], to macrochromosomes detected among others in some populations of Astyanax scabripinnis (Jenyns, 1842) [12].…”
Section: Introductionmentioning
confidence: 99%