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Down Cat-eLog Data Sheet
Scientific Name Pseudomystus mahakamensis  (Vaillant, 1902)
Common Name Bornean Clown Catfish
Type Locality Tepoe, Mahakam River, eastern Kalimantan, Borneo, Indonesia.
Synonym(s) Leiocassis mahakamensis
Pronunciation SUE doh MIST uss - ma hah kah man seess
Etymology From the Greek pseudos, meaning lie, and mystus, a genus of bagrid catfishes. In reference to the overall similarity of the two genera. The specific epithet comes from the type locality, the Mahakam River.
Down Species Information
Size 100mm or 3.9" SL. Find near, nearer or same sized spp.
Identification Members of the bagrid genus Pseudomystus are small- to mid-sized freshwater catfish endemic to Southeast Asia.Pseudomystus are commonly found in swamps and rivers throughout Southeast Asia. They can be differentiated from Leiocassis by a relatively short snout and a subterminal mouth. Many Pseudomystus have a color pattern of contrasting vertical bars or blotches.

This species is easily distinguished by its extremely slender body, highly depressed head and bold pattern of stripes.
Sexing Males have an elongate genital papilla in front of the anal fin.
Down Habitat Information
Distribution Asia: Sumatra and east Borneo.
Pacific, Greater Sunda Island Rivers, Borneo Waters, East Borneo Waters (click on these areas to find other species found there)

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IUCN Red List Category Data Deficient, range map and more is available on the IUCN species page. Last assessed 2019.
pH 5.8 - 6.8
Temperature 22.0-27.0°C or 71.6-80.6°F (Show species within this range)
Down Husbandry Information
Breeding Unreported.
Breeding Reports There is no breeding report.
Down Further Information
Reference Notes from the Leyden Museum v. 24 (note 1), pp 55, Figs. 4-5.
Registered Keepers There is but a single registered keeper, view all "my cats" data.
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There is no record of this fish being seen.
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Last Update 2020 Sep 26 01:51 (species record created: 2006 Dec 24 11:44)