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Band C of a) male and b) female of population C, with sexual chromosomes type XX/XY. Band C of c) male and d) female of population D, showing pair 19 with XX/XY. 

Band C of a) male and b) female of population C, with sexual chromosomes type XX/XY. Band C of c) male and d) female of population D, showing pair 19 with XX/XY. 

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Fig. 1 . Giemsa stained karyotypes of 
Fig 2.1. Ag-NORs of males and females a) of population A, b) of...
Fig. 3. Band C of a) male and b) female of population A, without...
Fig. 4. Band C of a) male and b) female of population C, with sexual...
CHROMOSOMIC CHARACTERIZATION OF FOUR POPULATIONS AND OCCURENCE OF SEXUAL CHROMOSOMES OF TYPE XX/XY, IN THE PANTANAL BASIN OF MATO GROSSO, BRAZIL
Article
Full-text available
  • Jan 2006
Sumary Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogenetically. They were from different rivers and creeks of the Pantanal Basin, in the state of Mato Grosso, Brazil. The populations were from four distinct locations: population A (4F and 8M), Coxipó river, in the county of Chapada dos Guimarães; populatio...
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Fig. 1. Giemsa stained karyotypes of A. cf. dubius with 2n=42...
Fig 2.1. Ag-NORs of males and females a) of population A, b) of...
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Ancistrus cf. dubius (Siluriformes, Ancistrinae), a complex of species. 1. Chromosomic characterization of four populations and occurence of sexual chromosomes of type XX/XY, in the Pantanal basin of Mato Grosso, Brazil
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Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogenetically. They were from different rivers and creeks of the Pantanal Basin, in the state of Mato Grosso, Brazil. The populations were from four distinct locations: population A (4F and 8M), Coxipó river, in the county of Chapada dos Guimarães; population B (4F...
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Citations

The Persevering Cytotaxonomy: Discovery of a Unique XX/XY Sex Chromosome System in Catfishes Suggests the Existence of a New, Endemic and Rare Species
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  • CYTOGENET GENOME RES
The genus Hypostomus has a broad geographic distribution in Brazilian rivers and comprises armored catfishes with a very complicated taxonomy due to the absence of morphological autapomorphies. The existence of nearly 10 allopatric populations with different karyotypes suggests that Hypostomusancistroides represents a species complex in the Upper Paraná River basin. In this paper, an unusual karyotype of an isolated H. aff. ancistroides population was investigated. All specimens of this sample have 2n = 66 chromosomes except for 1 male with 2n = 67, most likely due to a supernumerary chromosome. In this population, the sexes are dimorphic, the males are heterogametic, and an XX/XY sex chromosome system is present. Phylogenetic analysis using mitochondrial and nuclear DNAs indicated that this population forms a monophyletic group separate from the other populations of H.ancistroides and may represent an incipient species.
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