@article {614,
	title = {Derived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)},
	volume = {15},
	year = {2021},
	month = {Oct-08-2021},
	pages = {345-354},
	abstract = {<p><jats p="">The African weakly electric elephantfish family Mormyridae comprises 22 genera and almost 230 species. Up-to-date cytogenetic information was available for 17 species representing 14 genera. Here we report chromosome number and morphology in <jats italic="">Hyperopisus bebe</jats> (Lacep\&egrave;de, 1803) and <jats italic="">Pollimyrus isidori</jats> (Valenciennes, 1847) collected from the White Nile system in southwestern Ethiopia. Both taxa displayed the diploid chromosome number 2n = 40, but they differed in fundamental numbers: FN = 66 in <jats italic="">H. bebe</jats> and FN = 72 in <jats italic="">P. isidori</jats>; previously the same diploid chromosome number 2n = 40 was reported in an undescribed species of <jats italic="">Pollimyrus</jats> Taverne, 1971 (FN = 42) from the same region. Our results demonstrate that not only pericentric inversions, but fusions also played a substantial role in the evolution of the mormyrid karyotype structure. If the hypothesis that the karyotype structure with 2n = 50\&ndash;52 and prevalence of the uni-armed chromosomes close to the ancestral condition for the family Mormyridae is correct, the most derived karyotype structures are found in the <jats italic="">Mormyrus</jats> Linnaeus, 1758 species with 2n = 50 and the highest number of bi-armed elements in their compliments compared to all other mormyrids and in <jats italic="">Pollimyrus isidori</jats> with the highest number of bi-armed elements among the mormyrids with 2n = 40.</jats></p>
},
	issn = {1993-078X, 1993-0771},
	doi = {10.3897/compcytogen.v15.i4.67681},
	url = {http://dx.doi.org/10.3897/compcytogen.v15.i4.67681},
	author = {Simanovsky, Sergey and Medvedev, Dmitry and Tefera, Fekadu and Golubtsov, Alexander}
}
