General information |
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| Saccodon wagneri (Kner, 1863) | ||
| Synonyms |
- |
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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; Characiformes; Parodontidae. |
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| Geographical distribution | Peru; Ecuador |
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| Occurrence | Native: Peru, Ecuador |
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| Importance | ||
| Remarks | Telomeric repeat probe (TTAGGG)n located on telomeric regions of all chromosomes, without presence of interstitial telomeric sites. |
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Karyological information |
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| Geographical area of study | RÃo Bonito, El Guabo, El Oro Province, Ecuador. | |
| Source of chromosomes | Kidney cells. |
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| Number of specimens with sex | 11 ( (2 male, 9 female). |
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| Diploid chromosome number | 54 |
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| Karyotype formula | 32m+16sm+6st (male), 31m+16sm+7st (female). |
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| Fundamental arm number | 102 (m), 101 (f) |
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| Chromosome length | - |
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| Sex chromosome | ZZ/ZW sex chromosomes system present. Z is submetacentric. W is metacentric, twice as large as Z. |
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| Chromosome staining/banding/FISH | Single Ag-NOR pair located at tip of short arms of a small metacentric pair, probably pair 14. C-bands present in most chromosomes, presence of interstitial and terminal C-positive bands. A large heterochromatic block present on half-distal part of long arms of W chromosome in female metaphases, a similar band absent in Z chromosome. 18S rDNA probe present on a small metacentric pair, coinciding with Ag-NOR. 5S rDNA signal located on same chromosome pair, just below 18S, in syntenic condition. |
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| Reference(s) |
Nirchio M, Masache MC, Paim FG, Cioffi MB, Moreira Filho O, Barriga R, Oliveira C, Rossi AR. (2021). Chromosome analysis in Saccodon wagneri (Characiformes) and insights into the karyotype evolution of Parodontidae. Neotrop Ichthyol., 19(1): e200103. https://doi.org/10.1590/1982-0224-2020-0103. |
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