02686nas a2200169   4500008004100000022001400041245009600055210006900151260001600220520211300236100002302349700001802372700002802390700001502418700002102433856006202454       2019                        eng d  a0022-111200aHidden species diversity in Marcusenius moorii (Teleostei: Mormyridae) from the Congo Basin0 aHidden species diversity in Marcusenius moorii Teleostei Mormyri  cSep-12-20193 a<p>New collections from the Yangambi Biosphere Reserve (YBR) and Okapi Wildlife Reserve (OWR) revealed the presence of two groups of specimens similar to, but different from Marcusenius moorii. To study both these groups, an integrated morphological and genetic (mtDNA, cytb) approach was used. This study revealed that one of the two groups is conspecific with Marcusenius lambouri, a junior synonym of M. moorii, which is herein revalidated, with M. moorii longulus as its junior synonym. Marcusenius lambouri differs from M. moorii by a higher number of lateral line scales (44&ndash;46 vs. 40&ndash;43), a shorter pectoral‐fin length (14.6&ndash;19.9 vs. 20.3&ndash;25.2% standard length; LS) and a more elongated body due to a usually shallower middle body depth (19.8&ndash;26.5 vs. 26.3&ndash;35.9% LS). The other group revealed to be a new species for science, Marcusenius verheyenorum, which can be distinguished from its congeners with eight circumpeduncular scales by the following unique combination of characters: a rounded head with a terminal mouth; a short and deep caudal peduncle (middle caudal‐peduncle depth, 44.9&ndash;54.6% caudal‐peduncle length; LCP), a deep body (middle body depth, 27.7&ndash;34.2% LS), 38&ndash;43 scales on the lateral line, 40&ndash;41 vertebrae, 20&ndash;21 dorsal‐fin rays and 26 anal‐fin rays. Some specimens previously attributed to M. moorii were examined and reassigned to M. lambouri or M. verheyenorum. As a result, M. moorii and M. lambouri occur in sympatry in the middle Congo Basin, with the distribution area of M. moorii still further extending into the lower Congo Basin. Instead, the distribution of M. verheyenorum is limited to some right bank tributaries of the upstream part of the middle Congo Basin. Two museum records from the Lilanda River (YBR), collected in the 1950s and previously identified as M. moorii, were re‐identified as belonging to the new species, M. verheyenorum. However, the species now seems locally extinct in that region, which reflects the significant anthropogenic effects even within this reserve.</p>
1 aMambo Baba, Taylor1 aKisekelwa, T.1 aDanadu Mizani, Celestin1 aDecru, Eva1 aVreven, Emmanuel  uhttps://onlinelibrary.wiley.com/doi/abs/10.1111/jfb.14226