Clarias pseudonieuhofii is a species of clariid catfish from Borneo. It has been currently described from the upper basin of theKapuas River in West Kalimantan, in a geographicarea bordering Sentarum Lake. It has been differed from C. nieuhofii by comparing the holotypes and paratypes from specimens of C. nieuhofii from Sumatra.
It can be found in bodies of water in the Kapuas Hulu Regency, including in Lake Sentarum National Park.[1]
Described in 2004, the holotype for this specimen was noted to be of a length of 311 mm (31.1 cm) from skull to caudal fin, with 10 paratypes recorded to range from 230 to 316 mm (23-31.6 cm). This species is distinguishable from most other Southeast Asian forest Clarias species (except C. nieuhofii) by thecombination of the following characters:[1]
Clarias pseudonieuhofii differs from C. nieuhofii by a shorter anal fin, a longer pelvic fin, and a shorter occipital process, all in somewhat slight measurements.
In living specimens, the skin has been noted to be of dark brown to black, with deeper colors on the dorsalsurface of the body and the paired fins. The ventral surface is light brown. Overall, coloration is also somewhat similar to C. nieuhofii, hence the name.