Trigonopoma is a small genus of slender, schooling cyprinids from Southeast Asia, closely related to the rasboras and formerly classified within Rasbora before being split out. The atlas's two species, Trigonopoma gracile (the graceful rasbora) and T. pauciperforatum (the redstripe rasbora), range across Indonesia, Malaysia, Brunei, Cambodia, Singapore, and Thailand, growing to about 2–3 in, and are typically found in the blackwater streams, peat swamps, and slow-flowing forest waters characteristic of Sundaland lowlands.
Both species are well established in the aquarium trade as peaceful, elongated schooling fish, best kept in groups where their subtle coloration and a bold lateral stripe running the length of the body show to best effect, often in soft, slightly acidic blackwater-style setups that echo their native habitat. Neither is considered at conservation risk; both Trigonopoma gracile and T. pauciperforatum are currently assessed as Least Concern, reflecting a fairly wide distribution across the Malay Peninsula and neighboring islands.