Revision of Notoglanidium and related genera (Siluriformes: Claroteidae) based on morphology and osteology Author Geerinckx, Tom Author Vreven, Emmanuel Author Dierick, Manuel Author Hoorebeke, Luc Van Author Adriaens, Dominique text Zootaxa 2013 3691 1 165 191 journal article 10.11646/zootaxa.3691.1.7 d11a5ae6-35e5-4293-9a85-82ac1c22175c 1175-5326 221669 1756334F-DAFB-4029-999A-9D8D6458B94E Notoglanidium walkeri Günther 1903 ( Figs 6A, 6 B & 10I ) Syntypes . BMNH 1903.4.24.78–79: Ibbi river (near Beyin), Ghana ; approx. 5°0’N , 2°38’ W ; two spec., 92–99 mm SL. Other specimens examined. MNHN 1980.1270: N'pedo river, Agnébi basin, Ivory Coast ; 47 mm SL. MNHN 1970.14: Agnébi basin, Ivory Coast ; approx. 5°19’N , 4°20’W ; three spec., 32–72 mm SL. Diagnosis. Notoglanidium walkeri differs from other species in the genus in having: an average interorbital distance (27.8–33.3% HL) [ vs . smaller in N. boutchangai (17.2–23.4% HL), N. depierrei (18.2–23.7% HL), N. pallidum (20.0–23.3% HL) and N. pembetadi (17.4–24.0% HL), and larger in N. maculatum (35.3–36.8% HL) and N. thomasi (41.0–46.7% HL)]; a relatively small combined premaxillary tooth plate width (13.7–16.1% HL) [ vs . larger in N. akiri (22.0–26.1% HL), N. boutchangai (30.1–35.3% HL), N. macrostoma (33.5–41.7% HL) and N. pembetadi (21.0–26.4% HL)]; a relatively large number of soft dorsal-fin rays (11–15) [ vs . less in N. akiri (7), N. boutchangai (7), N. depierrei (9 or 10) and N. macrostoma (7), and more in N. maculatum (16–22)]. FIGURE 6 . A, Dorsal and B, lateral view of the skull region of N. walkeri (syntype, BMNH 1903.4.24.78–79, 92 mm SL). CT scan reconstructions. Only selected structures indicated (see text for details). Scale bars = 5 mm. FIGURE 7 . Most parsimonious trees of the nine Notoglanidium species and four outgroup species of the genera Chrysichthys , Auchenoglanis and Parauchenoglanis , based on 24 morphological and osteological characters listed in Table 1, with indication of character state changes per node. The base of the two trees (top of figure) is identical (shown only once). FIGURE 8 . Strict consensus tree of the nine Notoglanidium species and four outgroup species of the genera Chrysichthys , Auchenoglanis and Parauchenoglanis , based on 24 morphological and osteological characters listed in Table 1, with indication of standard bootstrap support values (top) and Bremer support values (bottom). Description. Snout nor body much depressed (predorsal body depth 14.1–20.2% SL, minimal caudal peduncle depth 13.0–14.6% SL, head depth 53.6–66.0% HL). Branchiostegal membranes completely fused. Dorsal fin with short spine (3.2–7.0% SL). See also Table 4. Colouration in life. Yellowish brown, with round dark spots scattered around body and fins. Maximum size recorded. 99 mm SL. Etymology. Named in honour of R.B.N. Walker, collector of the type specimens (Günther 1903). Distribution. Known from the Ibi (Ibbi) River in Ghana , and the Agnébi (Agneby) basin in Ivory Coast ( Fig. 13 ).