<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Simanovsky, Sergey</style></author><author><style face="normal" font="default" size="100%">Medvedev, Dmitry</style></author><author><style face="normal" font="default" size="100%">Tefera, Fekadu</style></author><author><style face="normal" font="default" size="100%">Alexander Golubtsov</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Derived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)</style></title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct-08-2021</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://dx.doi.org/10.3897/compcytogen.v15.i4.67681</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">15</style></volume><pages><style face="normal" font="default" size="100%">345-354</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;jats p=&quot;&quot;&gt;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 &lt;jats italic=&quot;&quot;&gt;Hyperopisus bebe&lt;/jats&gt; (Lacep&amp;egrave;de, 1803) and &lt;jats italic=&quot;&quot;&gt;Pollimyrus isidori&lt;/jats&gt; (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 &lt;jats italic=&quot;&quot;&gt;H. bebe&lt;/jats&gt; and FN = 72 in &lt;jats italic=&quot;&quot;&gt;P. isidori&lt;/jats&gt;; previously the same diploid chromosome number 2n = 40 was reported in an undescribed species of &lt;jats italic=&quot;&quot;&gt;Pollimyrus&lt;/jats&gt; 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&amp;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 &lt;jats italic=&quot;&quot;&gt;Mormyrus&lt;/jats&gt; Linnaeus, 1758 species with 2n = 50 and the highest number of bi-armed elements in their compliments compared to all other mormyrids and in &lt;jats italic=&quot;&quot;&gt;Pollimyrus isidori&lt;/jats&gt; with the highest number of bi-armed elements among the mormyrids with 2n = 40.&lt;/jats&gt;&lt;/p&gt;
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