02172nas a2200181   4500008004100000022002500041245015000066210006900216260001600285300001200301490000700313520152700320100002301847700002101870700001901891700002501910856005501935       2021                        eng d  a1993-078X, 1993-077100aDerived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)0 aDerived karyotypes in two elephantfish genera Hyperopisus and Po  cOct-08-2021  a345-3540 v153 a<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>
1 aSimanovsky, Sergey1 aMedvedev, Dmitry1 aTefera, Fekadu1 aGolubtsov, Alexander  uhttp://dx.doi.org/10.3897/compcytogen.v15.i4.6768101955nas a2200157   4500008004100000245018500041210006900226260002000295300001200315490000700327520133800334100001901672700001901691700002201710856006501732       2021                        eng d00aFrom fin rays to DNA: supplementary morphological and molecular data to identify Mormyrus subundulatus Roberts, 1989 (Pisces: Mormyridae) from the Bandama River in Côte d’Ivoire0 aFrom fin rays to DNA supplementary morphological and molecular d  c20 October 2021  a649-6580 v433 a<p>The genus Mormyrus Linnaeus, 1758 has been well studied in western Africa where five species are currently recognized. Mormyrus subundulatus Roberts, 1989 was described in 1989, and, although morphologically and genetically close to Mormyrus rume Valenciennes, 1847, is still considered by the most recent studies as a distinct species. It is endemic to the Côte d&rsquo;Ivoire and Ghana River systems. It was historically recorded from only three locations but is today very likely extirpated from one of them and threatened in the remaining two. It is categorized as &ldquo;Vulnerable B1ab(iii)&rdquo; by the IUCN Red List (Dankwa 2020). Although a few papers describe precisely the morphology and electric signal of the species, they are based on a very limited number of samples. In this paper, we present new data on the morphological characteristics of the species (extending the dorsal fin rays count range, which is the main morphometric criterium to distinguish M. subundulatus and M. rume) based on Museum samples and samples collected recently a few kilometers away from the type locality. Determination of the newly collected material was confirmed by the analysis of a frag- ment of the Cytochrome b gene, and we produced the first sequence fragment of the cytochrome oxydase subunit 1 (COI) for this species.</p>
1 aPrié, Vincent1 aAdam, Benjamin1 aMelki, Frédéric  uhttps://sciencepress.mnhn.fr/en/periodiques/zoosystema/43/27