02056nas a2200241 4500008004100000022001400041245014300055210006900198260001600267300001100283520124300294653003801537653002201575653001801597653001801615653001501633653002801648100002401676700001801700700002301718700002401741856004901765 2024 eng d a0380-133000aBiogeographic barriers are differentially permeable based on traits: Movement of hypoxia tolerant mormyrid fish in the Lake Victoria basin0 aBiogeographic barriers are differentially permeable based on tra cNov-01-2024 a1024853 a

Lake Nabugabo is a small satellite lake separated from Lake Victoria by hypoxic swamps that impose a biogeographic barrier to fish assemblages. Some species occur exclusively in Nabugabo while others show high differentiation across this barrier, yet air-breathing fishes show nearly zero genetic differentiation between the two lakes. We hypothesize that hypoxia-tolerant fishes, unlike other non-air-breathing species, would have similarly low genetic differentiation across the barrier. We used pooled RAD-seq to examine the degree of genetic differentiation in two species of non-air-breathing but hypoxia-tolerant mormyrid fishes, Marcusenius victoriae and Petrocephalus degeni. Other non-air-breathing fishes have been shown to have FST values as low as 0.05 but mostly between 0.10 and 0.20; however, we discovered that the genetic differentiation in our focal species was very low, with FST values between 0.02 and 0.04, making them much more comparable to air-breathing fishes with FST values of near zero. We conclude that this and other analogous barriers should be understood as differentially permeable depending on the traits of the organisms crossing them, such as hypoxia tolerance in this case.

10aDifferentially permeable barriers10aHypoxia tolerance10aLake Nabugabo10aLake Victoria10aMormyridae10aPopulation connectivity1 aHunt, David, A.G.A.1 aThomas, Quinn1 aClarke, Shelby, B.1 aChapman, Lauren, J. uhttp://dx.doi.org/10.1016/j.jglr.2024.10248502522nas a2200289 4500008004100000022002500041245007300066210006900139260001600208490000700224520164700231653001401878653002001892653002001912653002101932653003201953100002401985700002502009700002202034700002902056700002402085700002002109700002302129700001802152700002102170856004102191 2024 eng d a2045-7758, 2045-775800aTrophic ecology of the African riverine elephant fishes (Mormyridae)0 aTrophic ecology of the African riverine elephant fishes Mormyrid cAug-01-20240 v143 a

Multiple species of the elephant fishes (Mormyridae) commonly coexist in sympatry in most African tropical rivers and lakes. In this study, we investigated the trophic ecology and potential trophic niche partitioning of eleven mormyrid fish species from the Sanaga River system in Cameroon using the stable isotope composition of carbon and nitrogen in the muscle samples. Albeit most mormyrids mainly feed on invertebrates, we found differences in isotope ratios, and we report signs of the trophic niche partitioning among species. We further found significant differences in isotopic signatures within the Mormyrus genus, suggesting ecological niche diversification among three closely related species. We have also evaluated differences in the isotopic signals between seasons in four species, which could be possibly caused by species migration and/or anthropogenic agricultural activities. To evaluate body shape, we applied geometric morphometric analyses, and we show that most of the species are clearly morphologically separated. We focused on the mormyrid ecomorphology to identify a possible interaction between shape and ecology, and we found a relationship between the δ13C (but not δ15N) isotopic signal and morphology, suggesting their interplay during mormyrid evolution. Overall, we present robust evidence of the trophic niche partitioning within the mormyrid species community, and we integrate trophic ecology with morphometrics, shedding light on the enigmatic evolutionary history of these fascinating African fishes.

10amormyrids10astable isotopes10atrophic ecology10atrophic position10atrophic resource portioning1 aSommer, Gina, Maria1 aNjom, Samuel, Didier1 aIndermaur, Adrian1 aNyom, Arnold, Roger Bitj1 aJandová, Kateřina1 aKukla, Jaroslav1 aPetrtýl, Miloslav1 aHorká, Petra1 aMusilova, Zuzana uhttp://dx.doi.org/10.1002/ece3.7017301601nas a2200229 4500008004100000245015500041210006900196260001200265300001400277490000600291520085000297653000901147653001001156653002701166653001701193653000901210100002901219700002701248700002301275700001901298856005401317 2024 eng d00aOverall diet of four species of Marcusenius (M. monteiri, M. stanleyanus, M. sp.'malebo' and M. schilthuisiae) from Pool Malebo, Congo River, Kinshasa0 aOverall diet of four species of Marcusenius M monteiri M stanley c08/2024 a4195-42170 v63 a

The objective of this study was to analyze and compare the diet of four Marcusenius species living in the Malebo Pool. The Intestinal Coefficient of these fish ranges from 0.55 to 0.67. These average values make it possible to classify these species in the trophic group of invertivores (larvae of aquatic insects). The analysis of variance at the 5% threshold reveals that there is not a statistically significant difference between the average intestinal coefficients of 4 species of Marcusenius (Fischer = 2.46963; p = 0.06). stomach contents of M. monteiri, M. stanleyanus, M. schilthuisiae and M. sp.'malebo' confirm an invertivorous diet, with a predominance of benthic insect larvae, followed by crustaceans, periphyton and macrocosm organisms benthic that they find in their habitats.

10adiet10aindex10aintestinal coefficient10ainvertebrate10aprey1 aMabedi, Jean, Métis Ntu1 aZebe, Victorine, Mbadu1 aJean-Claude, Micha1 aJohan, Michaux uhttps://doi.org/10.33472/AFJBS.6.5.2024.4195-421700461nas a2200109 4500008004100000245009000041210006900131260007900200490000700279100001300286856005200299 1976 eng d00aExploration du Parc National de l'Upemba Mission G.F. De Witte, Fascicule 73 Poissons0 aExploration du Parc National de lUpemba Mission GF De Witte Fasc aBrusselsbFondation Pour Favoriser Les Recherches Scientifiques en Afrique0 v731 aPoll, M. uhttps://mormyrids.efishgenomics.com/fr/node/63301927nas a2200157 4500008004100000022001400041245006100055210006100116260001600177490000600193520147300199100001901672700001601691700002001707856004201727 2023 eng d a2517-484300aHistology of Convergent Probing Appendages in Mormyridae0 aHistology of Convergent Probing Appendages in Mormyridae cJan-01-20230 v53 a

Mormyridae is an early diverging family of Teleostean fishes that produce an electric field for navigation and communication using an electric organ. This clade has a diverse array of soft-tissue rostral appendages, such as the chin-swelling, the Schnauzenorgan, and the tubesnout combined with a Schnauzenorgan, that have evolved multiple times. Here we assess if macroscopically convergent, soft-tissue rostral appendages are also histologically convergent. Further, we investigate how the histology of these appendages can inform their function. We sampled independent gains of the chin-swelling and Schnauzenorgan to understand similarities and differences in their anatomies. We show that macroscopically convergent rostral appendages are also convergent at a histological level, and different types of rostral appendages share a similar anatomy; that said, minor differences likely relate to their specific functions. Based on a comparison of the skeletal muscle distribution and the differing attachment shapes of each appendage to the dentary, we conclude that the Schnauzenorgan is capable of a wider range of movements than the chin swelling. Furthermore, the anatomy suggests that these soft-tissue rostral appendages likely function as electrosensory foveas (i.e., an appendage that focuses a sensory system). Lastly, these histological data support the hypothesis that the chin swelling may be a precursor to the Schnauzenorgan.

1 aPeterson, Rose1 aEvans, A, J1 aHernandez, L, P uhttp://dx.doi.org/10.1093/iob/obad00101937nas a2200205 4500008004100000022001400041245014700055210006900202260001600271300001200287490000700299520122900306100002901535700002701564700002501591700002401616700002301640700002301663856004501686 2022 eng d a1996-078600aImpact of environmental features on the distribution of Marcusenius species (Pisces, Mormyridae) in Malebo Pool of Kinshasa in the Congo River0 aImpact of environmental features on the distribution of Marcusen cMay-31-2022 a164-1720 v163 a

The current anarchic exploitation of Marcusenius fish in the Malebo Pool located in the Congo River stands as a threat of extinction to certain species, while the ecology of most of them are hardly known. This study aims at evaluating the impact of environmental factors on the distribution of Marcusenius fish caught in six fishing stations in the Malebo Pool. Canonical correspondence analysis of environmental factors classified the stations into two groups, which differ in vegetation formation, bottom substrates, water current velocity, pH, suspended particles and in dissolved oxygen. Thus, the five stations located upstream and in the middle of the pool are characterized by low water current velocity, slightly acidic pH, bottom substrates composed of silt, plant debris, clay, silt and sand. The predominant Echinocloa and Eichhornia plant formations found in these sites provide shelter, food sources and impact on the distribution and abundance of seven Marcusenius species in Malebo pool. The rocky substrate of Kinsuka station associated with the plant formation dominated by Ledermanniella and Pennisetum, and a high-water current constitute a habitat that is not favourable for Marcusenius species.

1 aMabedi, Jean, Métis Ntu1 aZebe, Victorine, Mbadu1 aKiafu, Victor, Pwema1 aPIGNEUR, Lise-Marie1 aMichaux, Johan, R.1 aMicha, Jean-Claude uhttp://dx.doi.org/10.5897/ajest2022.310200858nas a2200145 4500008004100000022001400041245009800055210006900153260001600222520037400238100001900612700002200631700001700653856004200670 2022 eng d a2687-794500aThe Complete Genome Sequences of 38 Species of Elephantfishes (Mormyridae, Osteoglossiformes)0 aComplete Genome Sequences of 38 Species of Elephantfishes Mormyr cNov-21-20223 a

We present the complete genome sequences of 38 species of elephantfishes from 20 genera. Illumina sequencing was performed on genetic material from single wild-caught individuals. The reads were assembled using a de novo method followed by a finishing step. The raw and assembled data is publicly available via Genbank.

1 aPeterson, Rose1 aSullivan, John, P1 aPirro, Stacy uhttp://dx.doi.org/10.56179/001c.5607702035nas 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.5175.4.800583nas a2200109 4500008004100000245015500041210007000196300000800266490000800274100001600282856017500298 1971 eng d00aOstéologie des Genres Marcusenius Gill, Hippopotamyrus Pappenheim, Cyphomyrus Myers, Pollimyrus Taverne et Brienomyrus Taverne (Pisces Mormyriformes)0 aOstéologie des Genres Marcusenius Gill Hippopotamyrus Pappenheim a1440 v1881 aTaverne, L. uhttps://www.nhbs.com/osteologie-des-genres-marcusenius-gill-hippopotamyrus-pappenheim-cyphomyrus-myers-pollimyrus-taverne-et-brienomyrus-taverne-pisces-mormyriformes-book01343nas a2200109 4500008004100000245015100041210006900192520086600261100001901127700001501146856007201161 2000 eng d00aA morphological description of the sagittal otoliths of two mormyrids, Marcusenius macrolepidotus and Petrocephalus catostoma (Family: Mormyridae)0 amorphological description of the sagittal otoliths of two mormyr3 a

The morphology of the sagittal otoliths of two South African mormyrid fish, Marcusenius macrolepidotus and Petrocephalus catostoma, were studied to determine possible morphological significance. The sagittae of M. macrolepidotus and P. catostoma are kidney-shaped and oblong, respectively. The ventral margin is slightly indented in the former and slightly flattened in the latter. The sulcus acusticus of both species is archaesulcoid but mesial in M. macrolepidotus and ostio-caudal in P. catostoma. The crista inferior in M. macrolepidotus is ridge-like and well defined posteriorly and anteriorly, whereas in P. catostoma it is clearly defined posteriorly and disappears anteriorly. The otoliths of both species do not have a rostrum, antirostrum or an excisura. The differences in sagittal morphology between the two mormyrid species are distinct.

1 aNicolaai, N.N.1 aJooste, A. uhttps://www.tandfonline.com/doi/full/10.1080/15627020.2000.1140719100486nas a2200109 4500008004100000245011200041210006900153260007500222300001100297100001600308856005200324 1967 eng d00aThe fishes and fisheries of the Ruaha River basin, Tanzania (systematics, ecology, zoogeography, fisheries)0 afishes and fisheries of the Ruaha River basin Tanzania systemati aJinja, UgandabEast African Freshwater Fisheries Research Organization a19 pp.1 aMatthes, H. uhttps://mormyrids.efishgenomics.com/fr/node/59902224nas 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.4.1.102686nas 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

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 (44–46 vs. 40–43), a shorter pectoral‐fin length (14.6–19.9 vs. 20.3–25.2% standard length; LS) and a more elongated body due to a usually shallower middle body depth (19.8–26.5 vs. 26.3–35.9% 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, 44.9–54.6% caudal‐peduncle length; LCP), a deep body (middle body depth, 27.7–34.2% LS), 38–43 scales on the lateral line, 40–41 vertebrae, 20–21 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.

1 aMambo Baba, Taylor1 aKisekelwa, T.1 aDanadu Mizani, Celestin1 aDecru, Eva1 aVreven, Emmanuel uhttps://onlinelibrary.wiley.com/doi/abs/10.1111/jfb.1422602362nas a2200157 4500008004100000022001400041245017700055210006900232260001600301300001600317490000800333520170900341100001602050700001802066856012002084 2008 eng d a0022-094900aFemale choice by electric pulse duration: attractiveness of the males' communication signal assessed by female bulldog fish, Marcusenius pongolensis (Mormyridae, Teleostei)0 aFemale choice by electric pulse duration attractiveness of the m cMar-06-2009 a1969 - 19770 v2113 a

In adult males of the South African weakly electric bulldog fish, Marcusenius pongolensis, the duration of the electric organ discharge (EOD) increases with body size over lifetime. Although there is experimental support for intrasexual selection (male–male competition) having shaped the males' EOD pulse duration in evolution, nothing is known about intersexual selection, such as female choice. Playback of 25 natural male EODs of pulse duration varying from 320 μs (close to the average female value) to 716μ s, to eight female experimental subjects elicited approach, head butts and circling behaviour. The rate of head butts on the dipole electrode model increased significantly with stimulus pulse duration in seven out of eight experimental subjects. In ten experimental female subjects we contrasted the shortest playback pulse with simultaneous playback of one of four longer ones (424, 524, 628 and 716 μs). Pooled responses for all experimental subjects were stronger for the dipole playing back the longer pulse in a pulse pair. The difference in the number of head butts (Δhead butts) that were dealt the two dipoles per 60 s test session increased significantly with the difference in pulse duration (Δpulse duration). The increase followed a significant linear trend (P<0.0001). Similar results were obtained for Δassociation time, Δcircles with head butts, andΔ circles without head butts. These results suggest that a male's reproductive success is enhanced by longer, i.e. more attractive EODs, and that both intra- and intersexual selection must have played a significant role in shaping the EOD of male M. pongolensis.

1 aMachnik, P.1 aKramer, Bernd uhttp://jeb.biologists.org/cgi/doi/10.1242/jeb.016949https://syndication.highwire.org/content/doi/10.1242/jeb.01694902363nas a2200109 4500008004100000245017900041210006900220520188000289100001502169700001802184856005102202 2000 eng d00aElectrosensory prey detection in the African sharptooth catfish, Clarias gariepinus (Clariidae), of a weakly electric mormyrid fish, the bulldog (Marcusenius macrolepidotus )0 aElectrosensory prey detection in the African sharptooth catfish 3 a

During their seasonal runs in the Okavango and other freshwater bodies in southern Africa, the sharptooth catfish, Clarias gariepinus, specialises on the bulldog, Marcusenius macrolepidotus, as its main prey. We examined whether the catfish can locate bulldogs by detecting their pulse-type electric organ discharges (EODs). The electrosensory threshold for single-cycle, monopolar square-wave pulses was exceedingly low (down to 13 µVp–p/cm for 4-ms pulses) in trained, food-rewarded sharptooth catfish (n=4), confirming the results of Lissmann and Machin who were, however, unable to identify a biological function. Other stimulus pulse waveforms (single-cycle, monopolar as well as bipolar sine-wave pulses) were also effective stimuli according to their spectral low-frequency energy contents (0– 30 Hz). Male bulldogs display an EOD pulse approximately 10× the duration of female EODs (≈0.5 ms). The C. gariepinus threshold for field-recorded playbacks of a male bulldog EOD (of long duration) was 103 µVp–p/cm, whereas the brief female and juvenile EODs were not detected (using intensities of natural EODs). EODs of other mormyrids were detected when either monopolar or of long duration. Signal source amplitude increased linearly with standard length (SL) in bulldogs. Signal reach, as calculated from signal source amplitude and receiver sensitivity, is up to 150 cm for a large male bulldog (SL 27.5 cm), and 83 cm for a male that has just turned sexually mature (SL 12.6 cm). Therefore, most bulldogs eaten by catfish are probably male, in agreement with the size distribution of bulldogs found in catfish stomachs. These results suggest that sharptooth catfish rely heavily on their acute electrical sense during hunting, and an important function for electroreception in an African catfish has been identified.

1 aHanika, S.1 aKramer, Bernd uhttp://link.springer.com/10.1007/s00265000023202511nas a2200157 4500008004100000022001500041245013600056210006900192260001600261490000900277520182700286100001502113700002202128700002102150856018202171 2019 eng d a0936-9902 00aMarcusenius wamuinii (Teleostei: Mormyridae), a new elephantfish from the Mangroves National Park, Democratic Republic of the Congo0 aMarcusenius wamuinii Teleostei Mormyridae a new elephantfish fro c15 May 20190 v10903 a

Marcusenius wamuinii, a new large-scaled Marcusenius species, is described from the Mangroves National Park (MNP), a protected area situated at the mouth of the Lower Congo basin and its surroundings in the DR Congo. It can be distinguished from all its congeners based on the following unique combination of characteristics: 8 circumpeduncular scales, 27-31 anal-fin rays, 22-25 dorsal-fin rays, 19-22 scales between dorsal and anal fin, 46-53 lateral line scales, and a slender caudal peduncle (depth 4.4-5.9 % SL). Its status as a distinct species is ad- ditionally confirmed by genetic data from the mitochondrial cytochrome b gene. This is the first new fish species discovered in the MNP, highlighting the importance of freshwater conservation in this area in which the fish fauna is still poorly known.
Marcusenius wamuinii, une nouvelle espèce de Marcusenius à grandes écailles est décrite du Parc Marin des Mangroves (PMM), une zone protégée située dans l’embouchure du Bas Congo et ses environs en RD Congo. Elle se distingue de tous ses congénères sur la base de la combinaison unique des caractères suivants : 8 écailles circumpédonculaires, 27-31 rayons à la nageoire anale, 22-25 rayons à la nageoire dorsale, 19-22 écailles entre les nageoires dorsale et anale, 46-53 écailles en ligne latérale et un pédoncule caudal mince (hauteur 4.4-5.9 % SL). Son statut d’espèce distincte est également confirmé à base de résultats génétiques sur le gène mitochondrial cytochrome b. Ceci est la première nouvelle espèce de poisson découverte dans le PMM, soulignant l’importance de la conservation des eaux douces dans cette Zone, dont la faune de poissons est encore largement méconnue.

1 aDecru, Eva1 aSullivan, John, P1 aVreven, Emmanuel uhttps://www.researchgate.net/publication/333293882_Marcusenius_wamuinii_Teleostei_Mormyridae_a_new_elephantfish_from_the_Mangroves_National_Park_Democratic_Republic_of_the_Congo00535nam a2200121 4500008004100000245015200041210006900193260002200262300003200284490003000316100001500346856005200361 1868 eng d00aNaturwissenschaftliche Reise nach Mossambique auf Befehl Seiner Majestät des Königs Friedrich Wilhelm IV in den Jahren 1842 bis 1848 ausgeführt.0 aNaturwissenschaftliche Reise nach Mossambique auf Befehl Seiner  aBerlinbG. Reimer a i-viii + 1-116, Pls. 1-20.0 vZoologie. IV. Flussfische1 aPeters, W. uhttps://mormyrids.efishgenomics.com/fr/node/56802153nas a2200169 4500008004100000022001400041245015600055210006900211260001600280300000800296490000900304520155700313100001801870700002401888700001401912856005701926 2016 eng d a1175-532600aElectric organ discharges of South African Marcusenius species (Teleostei: Mormyridae) and their effectiveness as indicators of local species diversity0 aElectric organ discharges of South African Marcusenius species T cMay-11-2018 a3670 v42003 a

Recent morphological and genetic studies have revealed two new species of snoutfish in South Africa, Marcusenius caudisquamatus and M. krameri, which had been confused with M. pongolensis, the South African bulldog fish. All known mormyriform fish are nocturnal and emit electric organ discharges (EODs) for communication that are characteristic for their species. This paper examines whether or not the EODs of these three closely-related South African species can be differentiated from each other. An EOD pulse of a bulldog fish consists of a head-positive phase P, followed by a head-negative phase N of short duration. We measured and compared six variables of the EOD pulse waveform for South African samples for the three species from different locations using MANOVA, ANOVA and Discriminant Analysis, with M. devosi from Kenya as an outgroup. The EOD waveforms, normalized to the same P-phase amplitude, varied significantly from each other in four variables, most strongly in the amplitude of the N phase and the duration of the P phase. In two species, M. devosi and M. krameri, there was no evidence of difference between sexes, in contrast to M. pongolensis and M. caudisquamatus whose male pulses were of longer duration. M. devosi and M. krameri were statistically significantly independent of each other and of any other group studied. By contrast, the M. pongolensis specimens from different locations showed a high degree of variability amongst each other, including significant separation, and overlap with M. caudisquamatus.

1 aKramer, Bernd1 aMaake, Pholoshi, A.1 aGon, Ofer uhttp://biotaxa.org/Zootaxa/issue/view/zootaxa.4200.302614nas a2200181 4500008004100000022001400041245015700055210006900212260001200281300001400293490000700307520197000314100002702284700001402311700001602325700002102341856007002362 2016 eng d a0936-990200aMarcusenius kaninginii, a new species of elephantfish from the Lowa River basin, Democratic Republic of the Congo (Osteoglossiformes: Mormyridae)0 aiMarcusenius kaninginiii a new species of elephantfish from the  c03/2016 a341–3520 v263 a

Marcusenius kaninginii, a new Marcusenius species with eight large circumpeduncular scales, is described from the Lowa River, a right bank tributary of the Lualaba (Upper Congo basin). It is distinguished from all other Mar- cusenius species with eight circumpeduncular scales by the following unique combination of characters: 43-47 lateral line scales; 18-23 dorsal-fin rays; 27-30 anal-fin rays; 42-44 vertebrae; a relatively shallow body at the anterior base of the anal fin (depth 25.0-28.6 % SL); a deep caudal peduncle (39-57 % of caudal peduncle length); and a short pectoral fin (15.5-19.1 % SL). Additionally, it has a typical dark-brown body coloration with a black transversal bar between the anterior parts of the dorsal and anal fins, and a black horizontal band along the lat- eral line from just behind the opercle up to the transversal bar.


Marcusenius kaninginii, une nouvelle espèce de Marcusenius à huit écailles autour du pédoncule caudal, est décrite de la rivière Lowa, un affluent de la rive droite du Lualaba (bassin du Congo Supérieur). Il se distingue des autres Marcusenius à huit écailles autour du pédoncule caudal par la combinaison unique des caractères suivants: 43-47 écailles sur la ligne latérale; 18-23 rayons à la dorsale; 27-30 rayons à l’anale; 42-44 vertèbres; corps relativement moins élevé à la base antérieure de la nageoire anale (hauteur 25,0-28,6 % LS); un pédoncule caudal haut, (39- 57 % de la longueur du pédoncule caudal); et une nageoire pectorale courte (15,5-19,1 % LS). De plus, il présente une coloration corporelle typique noire-brunâtre avec une bande transversale noire entre les parties antérieures des nageoires dorsale et anale ainsi qu’une bande noire horizontale le long de la ligne latérale allant de l’opercule jusqu’à la bande transversale.

1 aKisekelwa, Tchalondawa1 aBoden, G.1 aSnoeks, Jos1 aVreven, Emmanuel uhttps://pfeil-verlag.de/wp-content/uploads/2016/07/ief26_4_04.pdf02046nas a2200229 4500008004100000022001400041245010400055210006900159260001600228300001100244520130700255653001201562653003001574653002801604653001501632653001901647653001501666100001801681700002901699700001801728856007001746 2016 eng d a1608-591400aMarcusenius desertus sp. nov. (Teleostei: Mormyridae), a mormyrid fish from the Namib desert0 aiMarcusenius desertusi sp nov Teleostei Mormyridae a mormyrid fi cJul-03-2016 a1 - 183 a

We critically compared Marcusenius specimens from the mouth of the Cunene River on the Namibia/Angola border, a harsh desert environment on the Atlantic Ocean coast virtually devoid of aerial insects with aquatic larvae which are an important food item, with Marcusenius multisquamatus Kramer & Wink, 2013 from the escarpment region of that same river, in a relatively rich and productive subtropical savannah environment. River mouth specimens were differentiated in morphology and electric organ discharges, as determined by ANOVA/MANOVA comparisons, principal component and discriminant analyses on morphological and electrophysiological characters, and genetics, including sequences of the mitochondrial cytochrome b gene, indicating reproductive isolation. Specimens from the river mouth differed from M. multisquamatus, their closest relatives, by having a shorter snout, a smaller eye diameter, and smaller nares separation. River mouth specimens were also differentiated from other, increasingly less-close relatives, such as M. altisambesi Kramer et al., 2007 from the Okavango River, Botswana, and from M. krameri Maake et al., 2014 from the Limpopo System, South Africa. We therefore designate the new species Marcusenius desertus sp. nov. for the Cunene River mouth population.

10aecology10aelectric organ discharges10agenetic differentiation10amorphology10aphylogeography10aspeciation1 aKramer, Bernd1 avan der Bank, F., Herman1 aWink, Michael uhttp://www.tandfonline.com/doi/full/10.2989/16085914.2015.113785502363nas a2200145 4500008004100000022001400041245013300055210006900188260001600257300001200273490000800285520184500293100002202138856005702160 2016 eng d a0022-094900aDifferences in electrosensory anatomy and social behavior in an area of sympatry between two species of mormyrid electric fishes0 aDifferences in electrosensory anatomy and social behavior in an  cApr-11-2016 a31 - 430 v2193 a

Sensory systems play a key role in social behavior by mediating the detection and analysis of communication signals. In mormyrid fishes, electric signals are processed within a dedicated sensory pathway, providing a unique opportunity to relate sensory biology to social behavior. Evolutionary changes within this pathway led to new perceptual abilities that have been linked to increased rates of signal evolution and species diversification in a lineage called ‘clade A’. Previous field observations suggest that clade-A species tend to be solitary and territorial, whereas non-clade-A species tend to be clustered in high densities suggestive of schooling or shoaling. To explore behavioral differences between species in these lineages in greater detail, I studied population densities, social interactions, and electric signaling in two mormyrid species, Gnathonemus victoriae (clade A) and Petrocephalus degeni (non-clade A), from Lwamunda Swamp, Uganda. Petrocephalus degeni was found at higher population densities, but intraspecific diversity in electric signal waveform was greater in G. victoriae. In the laboratory, G. victoriae exhibited strong shelter-seeking behavior and competition for shelter, whereas P. degeni were more likely to abandon shelter in the presence of conspecifics as well as electric mimics of signaling conspecifics. In other words, P. degeni exhibited social affiliation whereas G. victoriae exhibited social competition. Further, P. degeni showed correlated electric signaling behavior whereas G. victoriae showed anti-correlated signaling behavior. These findings extend previous reports of social spacing, territoriality, and habitat preference among mormyrid species, suggesting that evolutionary divergence in electrosensory processing relates to differences in social behavior.

1 aCarlson, Bruce, A uhttp://jeb.biologists.org/cgi/doi/10.1242/jeb.12772000372nas 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/3552077200553nas a2200121 4500008004100000245021100041210007100252260001200323300001100335490001700346100001600363856005200379 1971 eng d00aNote sur la systématique des poissons Mormyriformes. Le problème des genres Gnathonemus Gill, Marcusenius Gill, Hippopotamyrus Pappenheim, Cyphomyrus Myers et les nouveaux genres Pollimyrus et Brienomyrus0 aNote sur la systématique des poissons Mormyriformes Le problème  c09/1971 a99-1100 v84 (pts 1-2)1 aTaverne, L. uhttps://mormyrids.efishgenomics.com/fr/node/44600469nas 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/fr/node/98