lineatus is 54 chromosomes (metasubmetacentrics), fundamental number
It was found that the diploid number (2n), the fundamental number
(NF) and the number of autosomal arms (NFa) were 54, 56 and 52, respectively.
LeGrande (1981) proposed a hypothetical ancestral karyotype for Siluriformes with 2n=56 [+ or -] 2 and high Fundamental Number
(NF), which was supported by other studies in different species of the order (Oliveira and Gosztonyi, 2000).
The karyotype of the northern population specimen from Itapaje (MN 67469), had a diploid number (2n) of 52 and a fundamental number
(FN) of 92, and was comprised of 21 pairs of metacentric/submetacentric chromosomes, and four pairs of acrocentrics.
Previous studies on the Cichlidae family have reported a very constant diploid number 2n = 48 in different species (BENZAQUEM et al., 2008; FELDBERG; BERTOLLO, 1985; LOUREIRO, 1999; MARESCALCHI, 2005; MIZOGUCHI et al., 2007; PERAZZO et al., 2011; THOMPSON, 1979), despite a considerable variation in their fundamental number
In such cases, fundamental number
may be a more biologically relevant measure of variance than diploid number.
Furthermore, karyotypes of certain species show geographical variation in the fundamental number
of chromosomes as well as the diploid number of chromosomes as in the Genera Nannospalax and Meriones (5-7).
theory with applications, 2d ed.
It's such a fundamental number
yet it's not a big-picture focus.
acrobata showed the same diploid number, fundamental number
and chromosome morphology as Kerodon rupestris.
With a karyotype formula of 46M/SM + 12ST, the fundamental number
(FN) was 116; there were no differences between the two populations.