@article {662, title = {Morphometric synthesis of Pollimyrus (Teleostei, Mormyridae) with the description of four new species}, journal = {Journal of Fish Biology}, volume = {2024}, year = {2024}, month = {Nov-24-2024}, pages = {1-47}, abstract = {

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.

}, keywords = {morphology, Pollimyrus ibalazambai sp. nov., Pollimyrus krameri sp. nov., Pollimyrus vanneeri sp. nov., Pollimyrus weyli sp. nov., Taxonomy}, issn = {0022-1112, 1095-8649}, doi = {10.1111/jfb.15983}, url = {http://dx.doi.org/10.1111/jfb.15983}, author = {Dierickx, Katrien and Wamuini Lunkayilakio, Soleil and Bills, Roger and Vreven, Emmanuel} } @article {879, title = {Evidence 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 genetics}, journal = {Environmental Biology of Fishes}, volume = {67}, year = {2003}, pages = {47 - 70}, abstract = {

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.

}, issn = {03781909}, doi = {10.1023/A:1024448918070}, author = {Bernd Kramer and F. Herman van der Bank and Flint, Nicolette and Sauer-G{\"u}rth, Hedi and Michael Wink} } @article {354, title = {Effect of conductivity changes on the stability of electric signal waveforms in dwarf stonebashers (Mormyridae; Pollimyrus castelnaui, P. marianne)}, journal = {Journal of Comparative Physiology A}, volume = {194}, year = {2008}, month = {10/2008}, pages = {915 - 919}, issn = {1432-1351}, doi = {10.1007/s00359-008-0360-0}, author = {Baier, Bernd} } @article {823, title = {Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers}, journal = {Journal of Natural History}, year = {2014}, month = {12/2013}, pages = {1 - 35}, issn = {1464-5262}, doi = {10.1080/00222933.2013.807950}, author = {Bernd Kramer and F. Herman van der Bank and Michael Wink} }