Farlowella cf. amazonum (Günther, 1864)

Marajó, Leandro, Viana, Patrik F., Ferreira, Milena, Rapp Py-Daniel, Lúcia H. & Feldberg, Eliana, 2018, Cytogenetics of two Farlowella species (Loricariidae: Loricariinae): implications on the taxonomic status of the species, Neotropical Ichthyology 16 (4), pp. 1-8: 2

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http://doi.org/ 10.1590/1982-0224-20180029

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Farlowella cf. amazonum (Günther, 1864)


Farlowella cf. amazonum (Günther, 1864)   . Farlowella cf. amazonum   had diploid chromosome number 58 and karyotype composed of 14metacentric+30submetacentric+14subt elocentric, with fundamental number (FN) = 116 ( Fig. 1a View Fig ). No evidence was found of the presence of differentiated sex. The first chromosome pair had a secondary constriction on the long arm with a subtle difference between the two homologs. This region corresponded to the NOR ( Fig. 1c View Fig ) and the 18S rDNA sites ( Fig. 2c View Fig ).

C-bands are pale, distributed mainly in the centromeric position, although differing in amount among chromosomes. Additionally, some other conspicuous signals were also found, such as in the long arms of the 1 st pair   and the short arms of the 20th pair that were completely heterochromatic, and in both telomeric regions of pairs No. 13, 21, 26, 27, and 28 ( Fig. 1b View Fig ).

Hybridization with the 5S rDNA probe revealed signals only on the short arms of sm pair No. 20, which was completely heterochromatic ( Fig. 2d View Fig ). The mapping of the telomeric sequences revealed signals in the terminal regions of all the chromosomes, in addition to an accumulation of these sequences in the terminal portion of the long arms of pairs No. 16, 19, 21, 22, 26 and 27, no Interstitial Telomeric Sequences (ITS) were observed ( Fig. 2a View Fig ).