Some mormyrid species used for morphological comparison in this study. A Ivindomyrus marchei female, 135 mm SL, CUMV 98172, tag no. JPS-1233, Sébé River, Ogooué-Lolo, Gabon B Ivindomyrus opdenboschi female, 160 mm SL, CUMV 96829, tag no. JPS-1057, Ivindo River at Loa Loa, Ogooué-Ivindo, Gabon C Boulengeromyrus knoepffleri juvenile 107 mm SL, CUMV 96838, tag no. JPS-1055, Ivindo River at Loa Loa, Ogooué-Ivindo, Gabon D Marcusenius moorii female, 147 mm SL, CUMV 96836, tag no. JPS-1110, Ogooué River at Franceville, Haut-Ogooué, Gabon E Paramormyrops sp. (undescribed species) female, 100 mm SL, CUMV 98119, tag no. JPS-1148, Moumba Creek, Ogooué-Lolo, Gabon F Stomatorhinus walkeri female 95 mm SL, CUMV 80227, tag no. 2814, Diengui Creek, Moyen-Ogooué, Gabon G Hippopotamyrus castor female, 122 mm SL, CUMV 89955, tag no. 6018, Sanaga River at Nachtigal Falls, Centre, Cameroon H Cyphomyrus psittacus female, 109 mm SL, CUMV 96767, tag no. JPS-0438, Congo River at Yangambi, Orientale, D.R. Congo.