General information |
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| Trachydoras paraguayensis (Eigenmann & Ward, 1907) | ||
| Common name | Rique-rique | |
| Synonyms |
Hemidoras paraguayensis Eigenmann & Ward, 1907 |
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| IUCN Red List status (2014) | Not Reported |
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| Habitat | Freshwater |
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| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Siluriformes; Doradidae. |
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| Geographical distribution | Brazil; Argentina |
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| Occurrence | Native: Brazil, Argentina |
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| Importance | Food |
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| Remarks | Nil |
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Karyological information |
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| Geographical area of study | Iguaçu River (downstream Iguaçu falls), Middle Paraná River basin, Brazil. | |
| Source of chromosomes | - |
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| Number of specimens with sex | 16 (7 male, 9 female) |
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| Diploid chromosome number | 56 |
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| Karyotype formula | 36m+16sm+4st |
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| Fundamental arm number | 112 |
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| Chromosome length | - |
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| Sex chromosome | - |
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| Chromosome staining/banding/FISH | Pale heterochromatic blocks found mainly in telomeric regions of some chromosomes. Additional interstitial C-band observed in p-arm of metacentric pair 8 and q-arm of metacentric pair 11, submetacentric pair 19, and subtelocentric pair 27. One pair NORs located interstitially in q-arm of metacentric pair 11 that corresponds to C-band positive block and 18S rDNA probe signals. 5S rDNA showed 2 syntenic signals in pericentromeric region of p-arm and interstitial-medial region of q-arm of pair 22. |
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| Reference(s) |
Baumgärtner L, Paiz LM, Margarido VP, Portela-Castro ALB (2016). Cytogenetics of the thorny catfish Trachydoras paraguayensis (Eigenmann & Ward, 1907), (Siluriformes, Doradidae): Evidence of pericentric inversions and chromosomal fusion. Cytogenet. Genome Res.,149: 201-206. |
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