Hemibagrus bongan ( Popta, 1904 )

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 : 252-254

Hemibagrus bongan ( Popta, 1904)

( Fig. 33 )

Macrones bongan Popta, 1904: 182 (type locality: Borneo: Bongan [=Bungan] River); 1906: 35, Pl. 2 Fig. 5 . Bagrus planiceps (non Valenciennes, in Cuvier & Valenciennes,

1840) - Bleeker, 1860c: 18. Hemibagrus planiceps (in part) - Bleeker, 1862: 56, Pl. 71. Macrones planiceps (non Valenciennes, in Cuvier & Valenciennes,

1840) - Vaillant, 1902: 18. Macrones nemurus (in part) - Weber & de Beaufort, 1913: 341. Mystus planiceps (non Valenciennes, in Cuvier & Valenciennes,

1840) – Inger & Chin, 1962: 141, Fig. 71. Mystus nemurus (in part) - Watson & Balon, 1984: 933. Mystus nemurus (in part) - Roberts, 1989: 121. Mystus cf. planiceps - Roberts, 1989: 123. Hemibagrus cf. planiceps - Kottelat & Lim, 1995b: 238. Hemibagrus bongan - Parenti & Lim, 2005: 189; Ferraris, 2007:

87.

Material examined. — BORNEO: Sarawak: ANSP 176572 , 1 ex., 194.1 mm SL, Sungai Lawa, gravel area about 1.0km up from confluence with Batang Baram (3°30'N 114°27'E) ; CAS 55105, 5 ex., 104.5–187.1 mm SL , FMNH 68092 , 13 ex., 74.0–211.0 mm SL, Third division, Baleh River , Sungai Putai camp, Sungai Dapu ; FMNH 68063 , 7 ex., 41.7–216.0 mm SL, Third division, headwaters of Baleh River , 1000–1700 ft ; FMNH 68064 , 1 ex., 201.5 mm SL, Third division, headwaters of Baleh River, Sungai Bunoh ; FMNH 68084 , 4 ex., 47.5–104.9 mm SL, Third division, tributary of Baleh River between Sungai Entunau and Sungai Putai ; FMNH 68093 , 4 ex., 72.1–161.4 mm SL, Third division, Baleh River Sungai Putai camp (1°48'N 113°45'E) ; FMNH 68411 , 1 ex., 77.7 mm SL, Third division, headwaters of Baleh River ; FMNH 68925 , 18 ex., 44.1–109.3 mm SL, Third division, Kapit district , Mengiong River , Nanga Tekalit camp, tributary of Sungai Tekalit ; FMNH 68931 , 48 ex., 36.7–174.6 mm SL, Third division, Kapit district , Mengiong River , Nanga Tekalit camp, Sungai Satu ; FMNH 96273 , 1 ex., 46.0 mm SL, Sarawak ; NRM 41295, 1 ex., 217.7 mm SL, Fourth division, Baram River drainage, Sungai Kaha about 200 m from mouth ; USNM 324567 , 1 ex., 158.7 mm SL, Batang Balui tributary stream, Jangan Aya flowing into Batang Besua ; ZRC 40496, 1 ex., 152.8 mm SL, Kapit River .

BORNEO: Kalimantan Barat: RMNH 7548 , 2 ex., syntypes, 60.4–128.2 mm SL, Bongan [Bungan] ; MZB 9429 , 1 ex., 120,72 mm SL, Kapuas River drainage, Sungai Embaloh drainage, Sungai Dajo ; MZB 6545 , 1 ex., 123.8 mm SL, Kapuas River drainage, Sungai Embaloh, near the mouth of Sungai Tekelan ; MZB 9166 , 2 ex., 97.6–111.5 mm SL, Kapuas River drainage, Sungai Embaloh ; MZB 9428 , 1 ex., 45.1 mm SL, Kapuas River drainage, Sungai Embaloh drainage, Sungai Pajau ; MZB 9425 , 1 ex., 77.0 mm SL, Kapuas River drainage, Sungai Embaloh drainage, Sungai Sebaya ; MZB 9427 , 1 ex., 78.3 mm SL, Kapuas River drainage, Sungai Embaloh drainage, Sungai Senentang ; MZB 9437 , 2 ex., 63.4–134.1 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Jepala ; MZB 9438 , 7 ex., 56.6–153.5 mm SL , ZRC 43014, 2 ex., 152.4–174.9 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Haloi ; MZB 9436 , 2 ex., 94.8–99.3 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Menjulung ; MZB 9439 , 5 ex., 51.8–116.8 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Mentibat ; ZRC 43015, 1 ex., 205.0 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Nyampi ; MZB 9434 , 3 ex., 99.4–162.0 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Otang ; MZB 9440 , 3 ex., 60.6–165.7 mm SL , ZRC 43013, 1 ex., 100.1 mm SL, Kapuas River drainage, Sungai Mendalam drainage, Sungai Sebangan Ke ; MZB 7844 , 1 ex., 91.7 mm SL, Kapuas River drainage, Sungai Putan ; MZB 7715 , 1 ex., 85.6 mm SL, Kapuas River drainage, Sungai Sibau drainage, Sungai Sekedam Besar ; MZB 7958 , 3 ex., 42.7–76.9 mm SL, Kapuas River drainage, Sungai Sibau ; RMNH 7828 , 1 ex., 144.3 mm SL, Kapuas River drainage, Raoen .

BORNEO: Kalimantan Tengah: BMNH 2001.1 .15.180, 1 ex., 140.0 mm SL, Sungai Busang .

Diagnosis. — Hemibagrus bongan differs from H. divaricatus in having a longer adipose-fin base (15.1–21.1% SL vs. 11.1–15.5), a deeper adipose fin (maximum height 2.9–5.0 times in length of base vs. 1.9–3.2) and a larger eye (16–20% HL vs. 11–17), from H. gracilis in having a longer snout (33–41% HL vs. 30–35), and slightly fewer vertebrae (48–50, mode=49 vs. 50–52, mode=52), and from H. lacustrinus in having a more slender body (depth at anus 9.5–12.9 vs. 12.2–13.6), and a longer dorsal to adipose distance (11.0–16.6% SL vs. 7.6–10.9; adpressed dorsal fin not reaching vs. reaching origin of the adipose fin). It is distinguished from H. planiceps in having more vertebrae (48–50 mode=49 vs. 47–49, mode=47), a more slender body (depth at anus 9.5–12.9% SL vs. 11.3–14.7), a smaller interorbital distance (28–34% HL vs. 32–37) and longer maxillary barbels (199–283% HL vs. 148–220), and from H. velox in having fewer vertebrae (48–50, mode=49 vs. 50–52, mode=52), a relatively shorter genital papilla in the males (not reaching anal-fin origin, vs. reaching, Fig. 48 ) and the upper lobe of the caudal fin rounded posteriorly with principal ray not produced into a filament (vs. upper lobe regularly tapering with principal ray produced into a filament).

Description. — Biometric and meristic data as in Table 19. General description as for genus. Head depressed and broad, body moderately compressed. Snout length 33–41% HL. Interorbital distance 28–34% HL. Eye diameter 16–20% 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. Body depth at anus 9.5–12.9% SL. Adipose-fin base short, approximately as long as anal-fin base (15.1–21.1% SL); maximum height 2.9–5.0 times in length of base; separated from base of last dorsal-fin ray by distance of 11.0–16.6% SL. Dorsal spine stout, with 5–7 serrations on posterior edge; length 10.3–13.7% SL. Pectoral spine stout, with 13–22 large serrations on posterior edge; length 12.1–19.3% SL. Adpressed dorsal fin not reaching adipose-fin origin. Analfin origin slightly posterior to adipose-fin origin. Caudalpeduncle depth 5.7–8.8% SL. Caudal fin forked; upper lobe tapering with principal ray not produced into a filament, lower lobe rounded posteriorly. Maxillary-barbel length 199–283% HL. Inner mandibular-barbel length 34–88% HL. Vertebrae 48–50. Branchiostegal rays 10–12. Maximum recorded size 218 mm SL.

Males with elongate genital papilla not reaching origin of anal fin. Anus separated from genital appendages of both sexes by 5.5–7.5% SL.

Colour. — Dorsal surface of head and body uniform light grey to grey (live or freshly-dead specimens with yellowish hue, fading in preserved specimens); lateral line cream to yellow; ventral surface of head and body dirty white; adipose fin and fin rays of all fins grey; inter-radial membranes of all fins dirty yellow.

Distribution. — Known from the Kapuas, Rejang, Baram and Barito River drainages in western and southern Borneo ( Fig. 32 ).

Remarks. — The caption accompanying the photograph of one of the syntypes in Popta (1906: Pl. II, Fig. 5 ) lists the specimen as being 20 mm (TL). This is a typographical error, as the smaller syntype that the photograph illustrates is 60 mm SL (approx. 80 mm TL).

Figures

Fig. 33. Hemibagrus bongan, ZRC 43014, 174.9 mm SL, Borneo: Kalimantan Barat, Sungai Haloi.

Fig. 5. Map showing collection localities of Hemibagrus sabanus and H. semotus specimens examined in this study.

Fig. 48. Hemibagrus microphthalmus, CMK 14706, 204.6 mm SL, Thailand: Mae Name Moei.

Fig.32. Map showing collection localities ofHemibagrus planiceps, H. bongan, H. divaricatus, H. gracilis, H. lacustrinus, and H. velox specimens examined in this study.