Prionobrama is a small genus of South American tetras found across Argentina, Bolivia, Brazil, and Paraguay, mainly in the Amazon and Paraná-Paraguay drainages. The atlas's 2 species are modest in size, 2–2.5 in, with the slender, highly translucent body and bright orange-to-red tips on the caudal fin lobes that give the genus its common name, the glass bloodfins. That near-transparent body, through which the spine and swim bladder are faintly visible, is a distinguishing feature shared by both Prionobrama filigera and P. paraguayensis.
The glass bloodfin tetra has a modest but real presence in the aquarium hobby as an active, peaceful schooling fish for community tanks, prized for the flash of colour its tail adds against an otherwise clear body. It is generally considered hardy and undemanding for a mid-sized tetra. Conservation status is only partly assessed across the genus - one species is Least Concern and the other Not Evaluated - which is typical for South American characins with a wide range but limited targeted survey work.