02035nas a2200157 4500008004100000022002500041245019500066210006900261260001600330300001200346490000900358520142900367100001501796700001801811856004801829 2022 eng d a1175-5334, 1175-532600aMarcusenius elegans: a replacement name for Marcusenius gracilis Kramer 2013 (Osteoglossiformes: Mormyridae), a secondary junior homonym of Marcusenius senegalensis gracilis (Pellegrin 1922)0 aMarcusenius elegans a replacement name for Marcusenius gracilis  cAug-18-2022 a499-5000 v51753 a

The West African mormyrid Marcusenius gracilis Kramer 2013 is a secondary homonym of Gnathonemus gracilis Pellegrin 1922 when both species are placed in the same genus Marcusenius (International Code of Zoological Nomenclature, article 57.3). Marcusenius gracilis was first described by Kramer (2013: 123), based on a holotype and 16 paratypes from Ivory Coast, West Africa. The taxon was subsequently treated as a valid species of Marcusenius by Kramer & Wink (2013: 2334), and by Fricke et al. (2022). Kramer (2013) was not aware of Gnathonemus gracilis Pellegrin 1922, which was originally described by Pellegrin (1922: 221), based on a specimen from the Gribingui River, Lake Chad basin, in today’s Central African Republic. The holotype is extant (MNHN 1922-0023). The taxon was treated as a synonym of the West African species Marcusenius senegalensis (Steindachner 1870), but as a valid subspecies (Gosse 1984: 89, Lévêque et al. 1991: 138). Marcusenius senegalensis gracilis (Pellegrin 1922) has precedence over Marcusenius gracilis Kramer 2013, and the latter must be renamed when both taxa are classified in genus Marcusenius. Marcusenius elegans nom. nov. is herein proposed as the replacement name for Marcusenius gracilis Kramer 2013. The new species epithet is based on the Latin word elegans, meaning elegant, referring to its slender body; the name is treated as an adjective.

1 aFricke, R.1 aKramer, Bernd uhttp://dx.doi.org/10.11646/zootaxa.5175.4.802224nas a2200181 4500008004100000245016000041210006900201260001600270300001100286490000600297520155500303100002901858700002001887700001901907700002001926700001901946856007701965 2020 eng d00aAspects of life-history strategy of Marcusenius senegalensis (Pisces: Osteoglossiformes: Mormyridae; Steindachner, 1870) from Niger River in Northern Benin0 aAspects of lifehistory strategy of Marcusenius senegalensis Pisc cJan-01-2020 a1 - 130 v43 a

Marcusenius senegalensis (Steindachner, 1870) is the dominant mormyrid in Niger River in Northern-Benin where this fish species constitutes an important component of artisanal fisheries. The current study documented the reproductive biology of M. senegalensis in order to contribute to management and sustainable exploitation. Monthly samplings were conducted between February 2015 and July 2016 using gillnets, cast net, and seine. Males dominated the population with a sex ratio of 1:0.96 in favor of males. Sizes at first sexual maturity were 167.89 mm-TL for males and 163.81 mm-TL for females. Monthly gonadosomatic index (GSI) averaged 0.12 ± 0.09 for males and 1.32 ± 1.56 for female and peaks recorded indicated that spawning occured from June to September. Fecundity were moderate to low (844 – 12,643 eggs) and significantly (p < 0.05) increased with total length and body weight. Thespecies showed egg diameters varying between 0.21 and to 1.77 mm and ovaries comprised oocytes at all stages of maturation indicating that M. senegalensis displayed a multi-spawning behavior. Marcuseniussenegalensis exhibited a demographic strategy between r and K, yet more inclined towards K-selected strategy. In Niger River, reproduction grounds were being severely degraded affecting recruitment and stocks. The current findings are valuable data to design a species management scheme that should includes spawning ground protection, species conservation and valorization and fisheries/aquaculture development.

1 aAdjibade, Kayode, Nambil1 aAdite, Alphonse1 aArame, Hamidou1 aChikou, Antoine1 aAbou, Youssouf uhttps://www.doi.org/10.22161/ijfaf10.22161/ijfaf.4.110.22161/ijfaf.4.1.100372nas a2200121 4500008004100000245005100041210004900092260000900141300002300150490000700173100002100180856004900201 1870 eng d00aZur Fischfauna des Senegal. Dritte Abtheilung.0 aZur Fischfauna des Senegal Dritte Abtheilung c1870 a533-583, Pls. 1-8.0 v611 aSteindachner, F. uhttp://biodiversitylibrary.org/page/3552077200469nas a2200133 4500008004100000245010400041210007000145300001200215490000700227100001500234700001500249700002000264856005100284 1973 eng d00aContribution a l’étude de la faune ichthyologique du bassin du fleuve Sénégal. III. Mormyridae0 aContribution a l étude de la faune ichthyologique du bassin du f a665-7040 v351 aReizer, C.1 aMattei, X.1 aChevalier, J.L. uhttps://mormyrids.efishgenomics.com/en/node/98