Characidium purpuratum is a fish in the family Crenuchidae. It is native to South America and is found in the Amazon River basin at Andean tributaries to the margin of the Amazon River in Ecuador.

Size This species reaches a length of .

Etymology Characidium purpuratum has the specific name purpuratum, Latin for purple, because Steindachner described it as being "clad in purple", a reference to the purple colour of the caudal fin and anal fin.

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