Bagrichthys micranodus Roberts, 1989

Wibowo, Kunto, Muslim, Muslim, Afrisal, Muhammad, Priyadi, Agus, Kusumah, Ruby V. & Lukman, Lukman, 2024, First records of two siluriform fishes: Bagrichthys micranodus (Actinopterygii: Siluriformes: Bagridae) and Pangasianodon hypophthalmus (Pangasiidae) from Sumatra, Indonesia, Acta Ichthyologica et Piscatoria 54, pp. 95-101 : 95

Bagrichthys micranodus Roberts, 1989

Figs 1A , 2

Material examined.

MZB. 26910, 179.1 mm SL, Cala Lake , Musi Banyuasin, South Sumatra, Indonesia, 8 August 2023, collected by K. Wibowo, R.V. Kusumah, A. Priyadi, and L. Lukman.

Description.

Measurements shown in Table 1 . Head small, short and bulbous with short blunt snout (lateral view). Body elongated, compressed, with long caudal peduncle. Head and body covered by smooth skin. Eye oval, with free margin, situated entirely on dorsal half of head. Mouth small, inferior; lips with papillae; jaws without teeth; palate with few teeth covered by soft membrane. Gill openings wide; gill membranes broadly joined, not bound to isthmus. Lateral line complete, midlateral, posterior end slightly curved to upper lobe of caudal fin. Anus and urogenital openings situated midway between pelvic and anal fins. Four pairs of barbels present. Maxillary barbel longest, extending almost to vertical level of posterior edge of opercle. Nasal barbel slender, its length more than twice eye diameter. Inner mandibular barbel shortest, thickened, strongly crenulated. Outer mandibular barbel simple, without crenulations, its length less than that of nasal barbel. Dorsal fin with 2 spines; first very small, hidden under skin; second long, compressed, robust, sharply pointed, shorter than two anterior branched rays, posterior margin with 16 upwardly directed serrae. Adipose fin long, broad, with convex edge, originating from posterior end of dorsal fin to middle of posterior half of caudal peduncle. Pectoral fin with 1 spine and 9 rays; spine larger than second dorsal fin spine, robust, sharply pointed, posterior margin with 23 serrae; spine shorter than two anterior branched rays; origin of pectoral fin about level with posteriormost margin of opercular membrane. Pelvic fin with 6 rays; origin slightly posterior to posterior end of dorsal fin base; tip of adpressed fin not reaching origin of anal fin. Anal fin with 15 rays, positioned below midpoint of adipose fin. Caudal fin with 8 + 9 principal rays, deeply forked; upper and lower lobes pointed, outermost principal fin-rays extended as filaments; dorsal and ventral procurrent rays asymmetric, origins of dorsal lobe rays slightly anterior to that of ventral lobe rays.

Fresh specimen coloration.

(Fig. 1A ). Head dark brown dorsally, pale whitish ventrally. Body dark brown with two whitish vertical markings; first oblique, extending from origin of adipose fin to anterior part of anal fin base, second behind anal fin. Dorsal fin blackish dorsally, whitish ventrally. Adipose fin grey-greenish, white-edged posteriorly. Pectoral, pelvic, and anal fins black with broad hyaline bases. Caudal fin uniformly whitish.

Family Pangasiidae Bleeker, 1858

Pangasianodon Chevey, 1931

Figures

Figure 1. Photographs of fresh specimens of (A) Bagrichthys micranodus, MZB. 26910, 179.1 mm SL, (B) Pangasianodon hypophthalmus, MZB. 26911, 202.9 mm SL, and (C) P. hypophthalmus, MZB. 26912, 206.0 mm SL, collected from Cala Lake, South Sumatra.

Figure 2. Dorsal fin (A) and mandibular barbels (B) of Bagrichthys micranodus. White and red arrows indicate simple outer and crenulated inner mandibular barbels, respectively.