02820nas a2200253 4500008004100000022002500041245010600066210006900172260001600241300000900257490000900266520199800275653001502273653003602288653003202324653003302356653003002389653001302419100002202432700003402454700001702488700002102505856004002526 2024 eng d a0022-1112, 1095-864900aMorphometric synthesis of Pollimyrus (Teleostei, Mormyridae) with the description of four new species0 aMorphometric synthesis of Pollimyrus Teleostei Mormyridae with t cNov-24-2024 a1-470 v20243 a

Mormyridae, a species‐rich family endemic to Africa, remains taxonomically understudied. This has been the case for the genus Pollimyrus Taverne, 1971, which hinders further understanding of the distribution, ecology, and conservation of its species. Therefore, an in‐depth morphometric comparison of all currently valid species is carried out using most of the available type specimens. Species delineations were re‐evaluated, and four species new to science described: Pollimyrus ibalazambai sp. nov. (the Luki River, the Democratic Republic of the Congo), Pollimyrus krameri sp. nov. (the Lugenda River, Mozambique), Pollimyrus vanneeri sp. nov. (the Kouilou‐Niari River, the Republic of the Congo), and Pollimyrus weyli sp. nov. (the Buzi River, Mozambique). In this study, Pollimyrus guttatus is confirmed to belong to Pollimyrus, whereas Pollimyrus eburneensis and Cyphomyrus plagiostoma seem more similar to species allocated to other genera. No or only little morphological differences were found between the type series of several species, which could indicate the need for synonymization of these species (Pollimyrus cuandoensis with Pollimyrus marianne and Pollimyrus nigripinnis with Pollimyrus pulverulentus). As such 20 species are currently morphologically identifiable in the genus Pollimyrus. The present study highlights the critical need for further synthetic efforts and new collecting efforts across Africa for this and other Mormyridae genera.

10amorphology10aPollimyrus ibalazambai sp. nov.10aPollimyrus krameri sp. nov.10aPollimyrus vanneeri sp. nov.10aPollimyrus weyli sp. nov.10aTaxonomy1 aDierickx, Katrien1 aLunkayilakio, Soleil, Wamuini1 aBills, Roger1 aVreven, Emmanuel uhttp://dx.doi.org/10.1111/jfb.1598300379nas a2200109 4500008004100000245007000041210006400111300001200175490000700187100002600194856004900220 1911 eng d00aOn a collection of fishes from the Lake Ngami Basin, Bechuanaland0 acollection of fishes from the Lake Ngami Basin Bechuanaland a399-4310 v181 aBoulenger, George, A. uhttp://biodiversitylibrary.org/page/3164709500416nam a2200121 4500008004100000245005800041210005600099260005500155300000800210653001100218100001300229856005200242 1967 eng d00aContribution à la Faune Ichthyologique de l’Angola0 aContribution à la Faune Ichthyologique de l Angola aLisbonbCompanhia de Diamantes de Angola (DIAMANG) a38110aAngola1 aPoll, M. uhttps://mormyrids.efishgenomics.com/fr/node/10402901nas a2200181 4500008004100000022001300041245023200054210006900286300001200355490000700367520218500374100001802559700002902577700002102606700002302627700001802650856005102668 2003 eng d a0378190900aEvidence for parapatric speciation in the mormyrid fish, Pollimyrus castelnaui (Boulenger, 1911) from the Okavango-Upper Zambezi River systems: P. marianne sp. nov., defined by electric organ discharges, morphology and genetics0 aEvidence for parapatric speciation in the mormyrid fish Pollimyr a47 - 700 v673 a

We report on parapatric speciation in the mormyrid fish,Pollimyrus castelnaui (Boulenger, 1911), from the Okavango and the Upper Zambezi River systems. We recognise samples from the Zambezi River as a distinct species, P. marianne, displaying an eastern phenotype of electric organ discharge (EOD) waveform (Type 3) that is distinct from the western EOD phenotype (Type 1) observed in P. castelnaui samples from the neighbouring Okavango. Samples from the geographically intermediate Kwando/Linyanti River (a tributary of the Zambezi that is also intermittently connected to the Okavango) presented a more variable third EOD phenotype (Type 2). In 13 out of 14 morphological characters studied, the Zambezi River samples differed significantly from P. castelnaui. Morphologically and in EOD characters, the Kwando/Linyanti fish are distinct from both P. castelnaui and P. marianne. Sequence analysis of the mitochondrial cytochrome b gene unambiguously reveals that specimens from the Zambezi River System form a well supported taxon which clearly differs from P. castelnaui from the Okavango (1.5–2.5% sequence divergence).Within specimens from theKwando–Zambezi System some geographic differentiation can be detected (nucleotide substitutions up to 0.6%); but groups cannot be resolved with certainty. Significant allozyme differences were found between the Okavango and all other EOD types from the Upper Zambezi System, and, within the Zambezi System, between the Kwando (Type 2) and Zambezi (Type 3) individuals. The low Wright’s fixation index values, the lack of fixed allele differences, and small genetic distances provide little evidence for speciation between groups within the Zambezi System, but moderate to great fixation index values and significant allele frequency differences were observed between the Okavango and the other fishes. It is concluded that within the Zambezi System, differentiation between Kwando/Linyanti and Zambezi populations (as revealed by morphology and EOD waveform comparisons) is so recent that substantial genetic (allozyme and mitochondrial sequence) differences could not have evolved, or were not detected.

1 aKramer, Bernd1 avan der Bank, F., Herman1 aFlint, Nicolette1 aSauer-Gürth, Hedi1 aWink, Michael uhttps://mormyrids.efishgenomics.com/fr/node/5500512nas a2200133 4500008004100000022001400041245015200055210006900207260001200276300001400288490000800302100001700310856005100327 2008 eng d a1432-135100aEffect of conductivity changes on the stability of electric signal waveforms in dwarf stonebashers (Mormyridae; Pollimyrus castelnaui, P. marianne)0 aEffect of conductivity changes on the stability of electric sign c10/2008 a915 - 9190 v1941 aBaier, Bernd uhttps://mormyrids.efishgenomics.com/fr/node/33