Chaca serica Ng & Kottelat, 2012
photo by Ng, H.H.

Family:  Chacidae (Squarehead or angler catfish)
Max. size:  14.53 cm SL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  Asia: Barito, Kahayan, Kapuas (not to be confused with the larger river with an identical name in western Borneo) and the Mentaya river drainages in southern Borneo.
Diagnosis:  Dorsal spines (total): 1-1; Dorsal soft rays (total): 4-4; Vertebrae: 33-35. Distinguished from Chaca bankanensis by the absence (vs. presence) of a series of rugose ridges on the oral margin of the lower lip, and by having generally longer dorsal and ventral procurrent caudal-ray bases (32.8-37.3% SL vs. 29.4-32.8 and 16.0-19.2% SL vs. 13.6-16.3 respectively), and from both Chaca burmensis and Chaca chaca in having (vs. lacking) nasal barbels, four pectoral-fin rays (vs. five), and lacking (vs. having) a row of fimbriate skin flaps on the body dorsal to (and sometimes ventral to) the lateral line. Further differs from Chaca burmensis by the presence (vs. absence) of papillae around the eyes, a temporal fossa extending (vs. not extending) to the supraoccipital, and fewer serrae on the anterior edge of the pectoral spine (7-8 vs. 11-19) (Ref. 89888) Description: anal fin with ii,4, ii,4,i, ii,5,i, ii,6, iii,3,ii, iii,4,i, iii,5, iv,3,i, iv,4 or iii,6 rays (Ref. 89888)
Biology: 
IUCN Red List Status: Vulnerable (VU); Date assessed: 01 September 2018 (B1ab(i,iii)) Ref. (130435)
Threat to humans:  harmless


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