Characidium is a genus of freshwater ray-finned fish belonging to the family Crenuchidae, the South American darters. The fishes in this genus are mainly found in South America, but C. marshi is from Panama. They are small (less than long), slender fish that live on the bottom in flowing fresh waters and feed on small animals such as insects.Lujan, N.K., Agudelo-Zamora, H., Taphorn, D.C., Booth, P.N. & López-Fernández, H. (2013): Description of a New, Narrowly Endemic South American Darter (Characiformes: Crenuchidae) from the Central Guiana Shield Highlands of Guyana. Copeia, 2013 (3): 454-463.
Species Characidium contains the following recognized species:
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