Chiloglanis deckenii Peters 1868

Schmidt, Ray C., Bart Jr, Henry L. & Nyingi, Wanja Dorothy, 2015, Two new species of African suckermouth catfishes, genus Chiloglanis (Siluriformes: Mochokidae), from Kenya with remarks on other taxa from the area, Zootaxa 4044 (1), pp. 45-64 : 56-57

Chiloglanis deckenii Peters 1868

Within Kenya, Chiloglanis deckenii only occurs in the Pangani River basin ( Fig. 1 ). It is likely restricted to the Pangani River basin in Tanzania but a similar species is reported to occur within the Wami and Rufiji Rivers to the south ( Seegers 2008). This species was collected in large numbers in the Lumi River (Lake Jipe affluent) near rocks in fast flowing water. This species is distinguished from other Kenyan suckermouth catfishes in having long mandibular barbels and an oral disc that is distinctly wider than long ( Fig 5 ). Morphometric measurements and meristic counts of Kenyan C. deckenii are found in Table 3.

C. somereni (N=22) C.deckenii (N=15) C. sp aff. deckenii Tsavo R. (N=20) MORPHOMETRICS Range Mean±%SD Range Mean±%SD Range Mean±%SD Standard length (mm) 42.6–68.0 28.0–62.2 33.1–48.6

Head length 27.3–31.8 29.5±1.3 26.6–31.5 28.5±1.4 29.0–32.8 30.8±1.0 Head depth (maximum) 14.3–17.9 15.8±1.0 16.0–21.1 18.0±1.4 14.7–17.9 16.2±1.0 Body depth at anus 11.9–15.0 13.9±0.7 15.1–19.8 16.9±1.4 13.8–17.6 15.8±1.1 Occipital shield width (minimum) 5.5–7.0 6.4±0.5 3.9–5.4 4.6±0.4 3.0–4.8 3.8±0.4 Prepectoral length 27.4–30.1 28.9±0.7 26.0–29.1 27.8±0.9 27.9–32.0 29.7±1.1 Predorsal length 38.0–42.5 40.3±1.2 36.4–40.6 38.5±1.2 38.4–43.0 40.7±1.4 Prepelvic length 55.0–60.2 57.4±1.4 53.8–61.4 57.2±1.7 55.9–63.2 58.1±2.0 Preanal length 68.6–74.4 70.9±1.5 66.8–72.3 69.7±1.8 68.9–76.3 7.1±1.8 Eye diameter (horizontal) 3.4–4.5 3.8±1.1 3.8–5.5 4.2±0.5 3.8–5.1 4.4±0.3 Orbital interspace 7.3–8.6 8.0±0.4 6.3–7.9 7.0±0.5 5.5–7.8 7.0±0.6 Snout length 15.7–20.5 18.4±1.2 16.9–18.6 17.9±0.5 18.0–22.0 19.4±1.0 Premaxillary tooth-patch width 10.0–14.1 11.5±1.0 10.2–14.0 12.3±1.1 11.6–15.1 12.7±0.9 Premaxillary tooth-patch length 2.0–3.6 2.8±0.4 2.1–2.9 2.5±0.3 2.6–3.5 3.1±0.2 Mandibular tooth row width 1.9–2.6 2.2±0.2 1.5–2.6 2.0±0.4 1.6–2.6 1.9±0.3 Anterior nares interspace 3.6–5.1 4.4±0.4 3.4–4.8 3.8±0.4 3.8–5.4 4.5±0.4 Posterior nares interspace 3.1–4.3 3.7±0.4 3.5–4.8 4.0±0.4 3.8–5.1 4.4±0.3 Maxillary barbel length 7.5–11.9 9.5±1.3 7.8–11.5 9.4±0.9 6.8–11.0 9.1±1.1 Medial mandibular barbel length 2.1–3.7 2.9±0.5 2.0–3.3 2.7±0.4 1.5–3.3 2.7±0.5 Lateral mandibular barbel length 3.4–5.0 4.1±0.4 4.0–5.6 5.1±0.4 3.2–5.9 4.4±0.6 Mouth width 7.7–10.9 9.0±1.0 7.1–8.9 8.0±0.6 6.4–10.8 8.6±1.0 Oral disc width 17.4–21.5 19.4±1.2 14.9–20.4 17.6±1.3 18.2–22.4 19.8±1.3 Oral disc length 17.1–20.9 18.8±1.1 13.4–16.1 14.9±0.8 16.8–21.2 18.7±1.1 Upper lip length 3.7–6.0 4.8±0.5 3.0–4.0 3.6±0.3 3.4–5.4 4.6±0.5 Lower lip length 6.4–8.8 7.7±0.6 5.4–7.4 6.3±0.6 6.4–7.8 7.1±0.4

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Figures

FIGURE 1. Collection localities of Chiloglanis specimens included in this study and type localities of new species described herein: Chiloglanis deckenii (triangle), C. brevibarbis (circle), C. somereni (square), C. kerioensis (type locality—asterisk, paratypes—cross), and C. devosi (type locality—star). Drainage boundaries denoted by white lines.

FIGURE 5. Dorsal, lateral and ventral views of Chiloglanis devosi holotype, NMK FW / 3958 / 1, male, 36.0 mm SL; Kenya, Eastern Province, Northern Ewaso Nyiro (Ewaso Ng’iro) below Chanler’s Falls, Isiolo—Merti Road, 00.78056 ° N, 38.08021 ° E. Scale bar equals 1 cm. Photographs by R. C. Schmidt.