Hemibagrus hainanensis ( Tchang, 1935 )

Ng, Heok Hee & Kottelat, Maurice, 2013, Revision Of The Asian Catfish Genus Hemibagrus Bleeker, 1862 (Teleostei: Siluriformes: Bagridae), Raffles Bulletin of Zoology 61 (1), pp. 205-291 : 266

publication ID	https://doi.org/ 10.5281/zenodo.5351788
persistent identifier	https://treatment.plazi.org/id/CF180962-FFD4-FF8A-FF23-F4AAFAB58554
treatment provided by	Tatiana
scientific name	Hemibagrus hainanensis ( Tchang, 1935 )
status

Treatment

Hemibagrus hainanensis ( Tchang, 1935) View in CoL

( Fig. 41 View Fig )

Leiocassis hainanensis View in CoL - Tchang, 1935: 175, Fig. 2 View Fig (type locality: Hainan Island, China), 1937: 100; Herre, 1938: 427; Nichols, 1943: 44.

Macrones elongatus - Koller, 1927: 28.

Aoria chinensis (non Steindachner, 1883) - Harada, 1943: 9, Pl. 3, Figs. 5–6 View Fig View Fig .

Pseudobagrus hainanensis - Tchang, 1960: 22, Fig. 14 View Fig .

Mystus elongatus View in CoL (non Günther, 1864) - Ni & Wu, 1986: 174, Fig. 98.

Mystus pluriradiatus (non Vaillant, 1892) - Zheng & Dai, 1999: 70, Fig. 34 View Fig (in part).

Hemibagrus pluriradiatus (non Vaillant, 1892) - Chan & Chen, 2008: 51.

Hemibagrus hainanensis View in CoL - Ferraris, 2007: 88.

Material examined. — CHINA: Hainan Island : CAS 134022 About CAS , 1 ex., 59.0 mm SL , Hainan Island ; CAS 139619 About CAS , 2 ex., 104.2–168.5 mm SL, central part of Hainan Island ; ZRC 46156, 1 ex., 71.2 mm SL, Tongzha market .

Diagnosis. — Hemibagrus hainanensis is distinguished from both H. centralus and H. pluriradiatus in having a greater dorsal to adipose distance (10.1–10.4% SL vs. 0.0–8.5), from H. imbrifer in a brown (vs. grey) body in life, a shorter adipose-fin base (27.8–29.3% SL vs. 38.4–44.2), and sensory pores on body not easily visible (vs. relatively large sensory pores arranged in vertical columns along the sides of the body), and from H. variegatus in having fewer gill rakers on the first gill arch (18 vs. 19–21), a shorter post-adipose distance (11.2–11.6% SL vs. 12.9–14.1), and a uniform (vs. mottled) brown body in life. It further differs from H. centralus in having a shorter adipose-fin base (27.8–29.3% SL vs. 31.3–39.2), a more slender caudal peduncle (7.7–7.8% SL vs. 8.0–9.8), and a smaller interorbital distance (30% HL vs. 31–34) and from H. pluriradiatus in having a smaller eye (diameter 13–14% HL vs. 14–21),

Description. — Biometric and meristic data as in Table 26. General description as for genus. Head depressed and broad, body moderately compressed. Interorbital distance 30% HL. Eye diameter 13–14% HL. Dorsal profile rising evenly but not steeply from tip of snout to origin of dorsal fin, then sloping gently ventrally from there to end of caudal peduncle. Ventral profile horizontal to origin of anal fin, then sloping dorsally to end of caudal peduncle. Adipose fin with long base, about 3.0 times length of anal-fin base (27.8–29.3% SL) and spanning most of postdorsal distance. Origin of adipose fin separate from base of posteriormost dorsal-fin ray by distance of 10.1–10.4% SL. Post-adipose distance 11.2–11.6% SL. Dorsal spine stout, without serrations on posterior edge. Pectoral spine stout, with 11–18 large serrations on posterior edge. Caudal-peduncle depth 7.7–7.8% SL. Caudal fin forked; upper lobe rounded with principal ray produced into a filament, lower lobe rounded posteriorly. Sensory pores on body not prominent. Rakers on first gill arch 18. Maximum recorded size 550 mm SL (Ni & Wu, 1986).

Colour. — Preserved specimens with dorsal and lateral surfaces of head and body uniform brown, lateral line cream; ventral surface of head and body dirty white; adipose fin and fin rays of all fins brown; inter-radial membranes of all fins hyaline.

Distribution. — Known from Hainan Island off southeastern China ( Fig. 39 View Fig ).

Habitat and biology. — This species feeds on fishes, shrimps and aquatic insects, and breeds in May-June. The eggs are about 1.8–2.4 mm in diameter (Ni &Wu, 1986).