02227nas a2200181   4500008004100000022002500041245014800066210006900214260001600283300001200299490000700311520158600318100002301904700002101927700001901948700002501967856005301992       2020                        eng d  a1993-078X, 1993-077100aFirst cytogenetic information for five Nilotic elephantfishes and a problem of ancestral karyotype of the family Mormyridae (Osteoglossiformes)0 aFirst cytogenetic information for five Nilotic elephantfishes an  cAug-19-2020  a387-3970 v143 a<p><jats p="">The elephantfish family Mormyridae is the most diverse lineage of the primitive teleostean clade Osteoglossomorpha distributed in inland waters of all continents except Antarctica and Europe. The family Mormyridae is endemic to Africa and includes 22 genera and almost 230 species. The evolutionary radiation of mormyrids most probably should be attributed to their capability of both generating and receiving weak electric signals. Up-to-date cytogenetic studies have revealed substantial karyotype differentiation among the nine investigated elephantfish species and genera (a single species studied per each genus). In the present study, karyotypes of five species representing five mormyrid genera (four unexplored ones) collected from the White Nile system in southwestern Ethiopia are described for the first time. The results show substantial variety of the diploid chromosome and fundamental numbers: 2n = 48 and FN = 54 in <jats italic="">Brevimyrus niger</jats> (G&uuml;nther, 1866), 2n = 50 and FN = 72 in <jats italic="">Cyphomyrus petherici</jats> (Boulenger, 1898), 2n = 50 and FN = 78 in <jats italic="">Hippopotamyrus pictus</jats> (Marcusen, 1864), 2n = 50 and FN = 76 in <jats italic="">Marcusenius cyprinoides</jats> (Linnaeus, 1758), 2n = 52 and FN = 52 in <jats italic="">Mormyrops anguilloides</jats> (Linnaeus, 1758). Karyotype structure in the latter species seems to be close to the ancestral condition for the family. This hypothesis is discussed in the light of available data on karyotype diversity and phylogeny of mormyrids.</jats></p>
1 aSimanovsky, Sergey1 aMedvedev, Dmitry1 aTefera, Fekadu1 aGolubtsov, Alexander  uhttp://dx.doi.org/10.3897/compcytogen.14i3.52727