This genus has a confused taxonomy and there is uncertainty surrounding the number of valid species.[2] Certain East Asian bagrids formerly placed in this genus have been moved to Pseudobagrus.[2] In 2006, Heok Hee Ng considered the genus Leiocassis to be restricted to SundaicSoutheast Asia and Borneo and only a handful of species as valid (L. aculeatus, L. collinus, L. hosii, L. micropogon, L. poecilopterus, and L. tenebricus).[2]
The members of Leiocassis have an elongate narrow head and a prominently protruding snout.[2]
Species
There are currently 14 recognized species in this genus:[3]
^ abcdefgNg, Heok Hee; Lim, Kelvin K. P. (June 2006). "Two new species of Leiocassis (Teleostei: Bagridae), riverine catfishes from northeast Borneo". Ichthyol. Explor. Freshwaters. 17 (2): 165–172.
^Ng, Heok Hee; Hadiaty, Renny K. (March 2005). "Two new bagrid catfishes (Teleostei: Bagridae) from the Alas River drainage, northern Sumatra". Ichthyol. Explor. Freshwaters. 16 (1): 83–92.
^Ng, Heok Hee; Tan, Heok Hui. (October 2018). "Leiocassis bekantan (Teleostei: Bagridae), a new blackwater catfish from Borneo and Sumatra". Ichthyol. Explor. Freshwaters. 28 (4): 327–336.