Bagrichthys

The black lancer, Bagrichthys macracanthus, is a bagrid catfish described from Sumatra, Indonesia, and possibly endemic to that island. The name 'lancer' comes from the extended dorsal spine of several members of the genus. Fish from the Chao Phraya and Mekong once included in it were described as B. majusculus in 2002. A shy, nocturnal catfish of large, turbid rivers, it needs a dimly lit tank with plenty of hiding places and is territorial towards other bottom-dwellers.

The white-whisker lancer, Bagrichthys majusculus, is a bagrid catfish from the Mekong and Chao Phraya river systems in Thailand and Laos. Described from the Mun River in eastern Thailand, it is most similar to B. macracanthus and B. vaillantii and differs from both in its longer pectoral-fin spines. It inhabits large, turbid, slow rivers and moves into flooded riparian zones to spawn in the wet season. A shy, nocturnal fish, it is territorial towards other bottom-dwellers, especially its own kind.

Bagrichthys obscurus is a bagrid catfish from the Chao Phraya, Bang Pakong and Mekong watersheds in Thailand, Cambodia and Vietnam. One of the lancers, named for the extended dorsal spine in several members of the genus, it has a uniformly brown body with no pale stripe or blotches, a small mouth and a relatively short dorsal spine. It inhabits large, turbid rivers with slow flow, and is shy, nocturnal and territorial towards other bottom-dwellers.