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.1598302236nas a2200157 4500008004100000245011400041210006900155260001600224300001400240490000800254520161500262100002001877700002001897700002301917856013801940 1997 eng d00aSound Production and Reproductive Ecology of Strongly Acoustic Fish in Africa: Pollimyrus isidori, Mormyridae0 aSound Production and Reproductive Ecology of Strongly Acoustic F cJan-01-1997 a677 - 7250 v1343 a

We have studied the reproductive ecology and bioacoustic signals of weakly electric mormyrid fish in Africa in order to discover the natural conditions under which acoustic signals are used and to gain insight into the evolution of their acoustic behaviour and hearing. Pollimyrus isidori migrated from a tributary of the Niger River (Mali) into a shallow (2- 3 m) flood plain during the onset of the flooding seasons (August, 1991 and 1994). The fish were fully primed for reproduction upon entering the plain, females were significantly larger than males, and the sex ratio was skewed toward males (about 2 males per female). Males established territories (d ≈ 1 m) within the roots of floating rafts of grasses, about 0.5 m below the water surface. Males produced conspicuous acoustic displays consisting of Grunts and Moans during the night (130 dB peak re 1 μLPaat approximately 10 cm). These sounds had a fundamental of 340 Hz, but the band-width of the grunt extended to over 3 kHz. Experiments at the field site with captive animals showed that male sound production was stimulated by the presence of conspecific females. The P. isidori repertoire included 3 additional sounds. Analysis of environmental noise showed that these communication sounds fall within a distinct spectral window, thereby minimizing potential interference from other aquatic animals and abiotic noise sources. Waveform analyses showed that the sounds remained coherent over short distances (0.5 m) but lost amplitude more rapidly than would be predicted in a deep water free-field.

1 aBenech, Vincent1 aJacob, Philippe1 aCrawford, John, D. uhttps://brill.com/view/journals/beh/134/9-10/article-p677_3.xmlhttps://data.brill.com/files/journals/1568539x_134_09-10_s003_text.pdf