Ompok brevirictus
Ompok brevirictus Ng & Hadiaty, 2009
Ompok brevirictus
photo by Ng, H.H.


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Family:  Siluridae (Sheatfishes)
Max. size:  12.5 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  Asia: Sumatra, Indonesia. Known from the short coastal rivers that drain the western face of the Leuser Mountain Range in northern Sumatra, including the Kreung Kluet (Kluet River) drainage
Diagnosis:  Ompok brevirictus can be distinguished from all Southeast Asian congeners, except for O. siluroides and O. miostomus, in having melanophores on the tympanic region forming a prominent black spot (vs. tympanic region dark, but without any melanophores forming a distinct spot). It differs from O. siluroides and O. miostomus in having an evenly convex predorsal profile (vs. with a concavity posterior to orbit) and a more prominent lower jaw that is more broadly curving. Ompok brevirictus additionally differs from O. siluroides in having the mouth rictus separated from the anterior orbital margin by a distance of more than one-third (vs. less than one-third) eye diameter (4.2–5.2% HL vs. 3.2–3.7) and lacking (vs. possessing) a distinct dark wedge-shaped spot on base of the caudal fin (Ref. 82371).
Biology: 
IUCN Red List Status: Endangered (EN); Date assessed: 01 September 2018 (B1ab(iii)) Ref. (130435)
Threat to humans:  harmless


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