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Dorsal spines (total): 2-2; Dorsal soft rays (total): 5-6; Anal spines: 0-0; Anal soft rays: 10-11; Vertebrae: 34-35. Diagnosis: Chiloglanis kazumbei can be distinguished from all species in the Malagarasi and Luiche basins by the following combination of features: relatively long dorsal spine length, 16.1–21.3% of standard length vs. 7.5–13.6% in C. asymetricaudalis, 8.2–12.7% in C. igamba and 4.1–7.8% in C. orthodontus; relatively long pectoral spine length, 19.1–23.6% of standard length vs. 12.1–16.5% in C. asymetricaudalis, 9.9–15.1% in C. igamba and 10.9–17.2% in C. orthodontus; relatively wide occipital shield width, 6.1–8.3% of standard length vs. 3.7–4.7% in C. asymetricaudalis, 2.8–4.9% in C. igamba and 2.4–3.8% in C. orthodontus; and moderately long adipose fin length, 17.1–22.8% of standard length vs. 13.3-19.8% in C. asymetricaudalis, 10.3–16.3% in C. igamba and 25.0-31.3% in C. orthodontus (Ref. 87986). Additional features that distinguish C. kazumbei from congeners within its range include a distinctive pigmentation pattern with dark patches on the dorsal and pectoral fins, a dark band on the anal fin, and a caudal fin that is deeply forked with a slightly longer lower lobe vs. not deeply forked in C. lufirae, C. igamba and C. orthodontus, or forked with greatly elongated upper lobe in males of C. asymetricaudalis (Ref. 87986).
Description: Moderately sized Chiloglanis species, maximum standard length less than 70 mm; body roughly cylindrical, depressed anteriorly and compressed posteriorly; predorsal profile gently convex; postdorsal body sloping gently ventrally; preanal profile horizontal; anus and urogenital opening located slightly behind vertical through origin of adipose fin; skin covered with rounded unculiferous tubercles; lateral line complete and midlateral along side of body (Ref. 87986). Head depressed and broad, snout margin rounded when viewed dorsally; gill opening restricted to lateral aspect of head from level of base of pectoral spine to level of middle of eye; gill membranes broadly united to, and attached across isthmus, supported by 6 or 7 branchiostegal rays; skin covering skull roof with numerous small, round unculiferous tubercles; occipital-nuchal shield large, slightly visible through skin dorsally; mouth inferior, lips form ventrally-directed oral disc; oral disc moderate in size, wider than long and covered by numerous papillae; posterior margin of oral disc with well-developed cleft present at midline; barbels in three pairs and well developed; maxillary barbel slender and unbranched, originating just anterior to widest point of oral disc and extending to middle of eye; short basal membrane present on maxillary barbel; mandibular barbels incorporated into lower lip and visible as trifurcate structures in cleared and stained specimens; medial mandibular barbels on each side of midline; primary barbel elongate and bordered by short auxiliary barbel on each side; lateral mandibular barbels just lateral to medial mandibular barbels, somewhat more pronounced than medial mandibular barbels; primary barbel elonget and bordered medially by single short auxiliary barbel (Ref. 87986). Premaxillae formed as block-like plates supporting 47-85 'S'-shaped, pointed primary teeth on ventral surface; 30-40 small secondary teeth on posterior surface of premaxillae; 16 needle-like tertiary teeth inserting above and behind secondary teeth towards roof of mouth and gathered at midline; dentary with well-formed tooth cup along anterior margin supporting one or two rows of 3-14 robust, 'S'-shaped teeth per row with pointed tips; when present, posterior row represents replacement teeth; mandibular teeth bunched at midline (Ref. 87986). Eyes smell and ovoid, horizontal axis slightly longer than vertical axis; approximately one half of orbital interspace; orbit without free margin; anterior nares slightly further apart than posterior nares; anterior nares tubular with short, raised rim; posterior nares with elevated flaps along anterior margin (Ref. 87986). Dorsal fin located at anterior third of body; dorsal fin with spinelet, spine and 5-6 rays; fin membrane not adnate with body; dorsal-fin spine long and straight; relatively smooth along anterior margin, but posterior margin with weakly developed serrations only visible in cleared and stained specimens; adipose fin moderate in size, base less than one quarter of standard length; margin gently convex and incised posteriorly; caudal fin forked; count i,7,8,i; procurrent caudal-fin rays symmetrical and extending only slightly anterior to fin base; anal-fin base located ventral to adipose-fin base; margin convex; anal-fin count iii,7-8; pelvic-fin origin at vertical between bases of adipose and dorsal fins; pelvic-fin margins convex, tip of adpressed fin just short of anal-fin origin; pelvic-fin count i,6; pectoral fin with slightly curved, stout spine; anterior margin smooth, but posterior margin with weakly developed serrations only visible in cleared and stained specimens; pectoral fin count I,7-8; cleithral processes moderate in length and pointed, but largely buried in skin; axillary pore present along ventral margin of cleithral process; often depigmented relative to surrounding skin surface (Ref. 87986).
Colouration: In ethanol, in dorsal view, specimens appear dark brown, with two lighter bands on posterior half of body; first band lies midway between dorsal and adipose fins; second band lies at posterior end of adipose fin; head is uniformly dark brown; in lateral view, specimens appear dark brown with varying numbers of small irregular light patches; ventral surface cream coloured and peppered with dark melanophores from oral disc to caudal fin; oral disc, all barbels, anus and urogenital opening cream coloured; some specimens with midline cluster of melanophores just anterior to premaxillae; dorsal and pectoral spines and rays light brown; base of dorsal and pectoral-fin rays generally darker; fin membranes translucent with dark patch, broadest at spine and tapering towards inner rays; pelvic and anal fins translucent; anal fin bisected by dark band running across fin rays; adipose fin translucent with dark base; each lobe of caudal fin with dark crescent-shaped ventral patch continuous with very dark pigment at base of fin rays (Ref. 87986). |