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FIGURE 9 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 9. Waveforms and power spectra of EODs from Stomatorhinus walkeri (A – D), S. ater (E, F) and S. patrizii (G, H) on the same time scale as those shown in Fig. 5. EOD waveforms are centered about the largest headnegative peak, normalized to the same peaktopeak height and plotted with head positivity upward for each trace. Power spectra are normalized so that the peak energy is adjusted to 0 dB. Individual specimen numbers are indicated beneath waveforms; F = female, M = male.

FIGURE 8 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 8. Scores from types of S. ivindoensis n. sp. and five other Stomatorhinus species on the second and third factors of a principal components analysis of the covariance matrix calculated from 24 logtransformed morphometric measures. Twelve nontype specimens of S. walkeri and one nontype of S. polli included. Variables loading most heavily on the second principal component are caudal peduncle depth, interorbital distance and internostril distance. Variables loading most heavily on the third principal component are eye diameter, postorbital head length and caudal

FIGURE 5 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 5. EOD waveforms (left) and power spectra (right) for Stomatorhinus ivindoensis n. sp. The holotype of S. ivindoensis, a male, is shown in A and B. Peaks are numbered in order from P 0 to P 3. EOD waveforms are centered about the largest headnegative peak and plotted with head positivity upward. Power spectra are normalized so that the peak energy is adjusted to 0 dB. EODs of reproductive males (E, F) are longer in duration and have a lower peak power frequency than those of females (C, D). Individual specimen numbers are indicated beneath waveforms; F = female, M = male, H = holotype. Time base = 0.1 millisecond.

FIGURE 7 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 7. Selected morphometric ratios of S. ivindoensis n. sp. compared to those in S. fuliginosus (A) and S. polli (B). IO = interorbital distance, HW = head width, CPD = caudal peduncle depth measured at terminus of anal fin, CPL = caudal peduncle length, E = eye diameter, HL = head length.

FIGURE 4 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 4. Typical forest creek habitat of Stomatorhinus ivindoensis n. sp.: upper “ Balé Creek ” within the Ipassa Plateau Reserve near Makokou, Gabon.

FIGURE 3 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 3. Collection sites of Stomatorhinus ivindoensis n. sp. (circles) and S. walkeri (triangles) in the Ivindo and Ogooué River basins of Gabon and the KouilouNiari basin of the Republic of Congo. Shaded areas delimit the boundary of the Lower Guinea ichthyofaunal province of West Central Africa.

FIGURE 2 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 2. Photograph (A) and radiograph (B) of preserved holotype of Stomatorhinus ivindoensis n. sp., CU 85157, 43.8 mm SL, male; (C) live paratype specimen no. 1004, CU 75437, 40.8 mm SL, male; (D) preserved paratype, CU 85465, 52.2 mm SL, female.

FIGURE 1 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 1. Drawing of Stomatorhinus ivindoensis n. sp. holotype, 43.8 mm SL. Drawn by Vera Ming Wong.

FIGURE 6 in A new Stomatorhinus (Osteoglossomorpha: Mormyridae) from the Ivindo River, Gabon, West Central Africa

FIGURE 6. Species of Stomatorhinus to which Stomatorhinus ivindoensis n. sp. is closely compared in study: (A) S. walkeri syntype BMNH 1867.5. 3.16, 85.6 mm SL; (B) S. walkeri live specimen no. 2880, CU 80237, 95 mm SL; (C) S. fuliginosus syntype MRAC 6652, 37.7 mm SL; (D) S. fuliginosus syntype MRAC 6648, 33.5 mm SL; (E) S. polli paratype MRAC 138993, 61.3 mm SL; (F) S. polli paratype MRAC 138977, 58.7 mm SL.

FIG. 1. — A in From fin rays to DNA: supplementary morphological and molecular data to identify Mormyrus subundulatus Roberts, 1989 (Pisces: Mormyridae) from the Bandama River in Côte d'Ivoire

FIG. 1. — A, radiography of the paratype SU 63507 Mormyrus subundulatus Roberts, 1989 from the Tano River (© California Academy of Sciences, Dept. of Ichthyology); B, specimen number MNHN-IC-2018-0558 caught in the Bandama River near the type locality; C, specimen number MNHN-IC-2018-0559. Scale bar: A, 10 cm.

FIG. 4. — A in From fin rays to DNA: supplementary morphological and molecular data to identify Mormyrus subundulatus Roberts, 1989 (Pisces: Mormyridae) from the Bandama River in Côte d'Ivoire

FIG. 4. — A, Distribution of Mormyrus subundulatus Roberts, 1989 according to available data; B, the Bandama River in the type locality is impacted by the Taabo dam just upstream; C, preserved stream habitat downstream the type locality where M. subundulatus still lives. This part of the River will be lost after the impoundment of another big dam, planned for the next few years; D, aerial view (GoogleEarth) of the Tano River in the type locality (red dot); E, upstream, showing the important buildup of soil and mud due to mining activities. The Tano River does not seem to host suitable habitat for M. subundulatus anymore, at least around the historical locality.

FIG. 3 in From fin rays to DNA: supplementary morphological and molecular data to identify Mormyrus subundulatus Roberts, 1989 (Pisces: Mormyridae) from the Bandama River in Côte d'Ivoire

FIG. 3. — Distribution of the dorsal fin rays counts for the specimens of M. subundulatus Roberts, 1989 examined by us (blue bars) and for the specimens of M. rume Valenciennes, 1847 (data from Lévêque and Bigorne, 1985; orange bars). Yellow bars: specimens presumably from the Sassandra River population. (1) position of paratype CAS-SU63507 from the Tano River in Ghana (red bar); (2) position of specimen MNHN-IC-2018-0558, for which genetic data confirms the identification as M. subundulatus.

FIG. 2 in From fin rays to DNA: supplementary morphological and molecular data to identify Mormyrus subundulatus Roberts, 1989 (Pisces: Mormyridae) from the Bandama River in Côte d'Ivoire

FIG. 2. — Bayesian phylogenetic analyses base on Cyt b gene fragment (A) and COI gene fragment (B). Numbers on branch node indicate posterior probability values, only node with posterior probability above 85 are represented. Nodes with probability> 98 are identified with *. Numbers on specimens indicate the GenBank accession number of the sequence or, when many specimens shared the same haplotype, the haplotype names in Table 1.

Figure 5 in Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa

Figure 5. - Scatterplot of logarithmic total signal duration in µs versus logarithmic peak of fast Fourier transformation in Hz. Each symbol represents a single EOD from M. caschive (open triangle, n = 8), M. hasselquistii (open inverse triangle, n = 31), M. kannume (filled triangle, n = 3) and M. rume (filled inverse triangle, n = 7).

Figure 4 in Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa

Figure 4. - Boxplots of selected signal characteristics. A: Total EOD duration in µs; B: Relative amplitude of main positive phase; C: Peak frequency of fast Fourier transformation in Hz.

Figure 3 in Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa

Figure 3. - Exemplary AC coupled measurements of electric organ discharges (EODs) of Mormyrus species. A: M. caschive, 97 mm SL, White Nile at Kosti, Sudan. B: M. kannume, 169 mm SL, White Nile at Khartoum, Sudan. C: M. hasselquistii, 188 mm SL, Mare Diwouni, Pendjari National Park, Benin. D: M. rume, 230 mm SL, Ouémé at Kpoto, Benin.

Figure 2 in Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa

Figure 2. - AC coupled measurement of electric organ discharge (EOD) of Mormyrus caschive (97 mm SL; White Nile at Kosti, Sudan) showing nomenclature of waveform characteristics as used in this study. m-POS = main positive phase; m-NEG = main negative phase; p-POS = posterior positive phase. Beginning and end of the signal is given by exceeding 1.5% of the total amplitude; beginning and end of phases within the signal by zero-crossings.

Figure 1 in Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa

Figure 1. - Outline of the African continent showing sampling sites of the study. Only sampled river systems are displayed.