The genus Prionobrama currently contains only one other valid species, P. paraguayensis. It is very similar in appearance to P. filigera, but lacks any red pigmentation in the caudal fin. It's probably never been imported for the hobby, although it may show up as occasional bycatch amongst shipments of more popular species.

P. filigera can be easily distinguished from the "other" bloodfin tetra, Aphyocharax anisitsi by its more elongate body shape and the fact that it exhibits…