Hemibagrus undetermined

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 : 270

HEMIBAGRUS WYCKII SPECIES GROUP

Artificial key to the members of the H. wyckii species group

1. Dorsal spine long (12–16% SL), well ossified (at least as thick as branched dorsal-fin rays), with 10–12 serrations on posterior edge; humeral region cream-coloured; maxillary barbels reaching to middle of dorsal-fin base (mainland and Sundaic Southeast Asia). ......................................................... H. wyckii

– Dorsal spine short (8–13% SL), poorly ossified (thinner than branched dorsal-fin rays), without serrations on posterior edge; cleithral region grey, brown or green; maxillary barbels reaching at least to middle of adipose-fin base.....................................2

2. Dorsal to adipose distance 4–7% SL; body olive green; fins orange (southern India). ......................................... H. maydelli

– Dorsal to adipose distance 9–14% SL; body grey; fins grey or red............................................................................................3

3. Fins red in life; head wide (20–24% SL); eyes set wider apart (32–37% HL) (mainland Southeast Asia).......... H. wyckioides

– Fins grey in life; head narrow (18–20% SL); eyes set nearer together (28–32% HL) ( Myanmar)............ H. microphthalmus

Remarks. — A fossil species of Hemibagrus ( H. major ) described from Miocene deposits in Lake Phetchabun, north central Thailand, is presumably a member of this species group, as evidenced by the high vertebral count (54–56) and its general resemblance to H. wyckioides and H. microphthalmus (see Roberts & Jumnongthai, 1999).