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Dianema urostriata.JPG
Dianema urostriatum
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Callichthyidae
Subfamily: Callichthyinae
Genus: Dianema
Cope, 1871
Type species
Dianema longibarbis
Cope, 1872

Dianema is a small genus of freshwater catfish in the Callichthyinae subfamily of the armored catfish family. The type species for this genus is Dianema longibarbis. The name is derived from the Greek di, meaning "two", and nema, meaning "filament".[1] The two species of Dianema share approximately the same distribution, and are found in the Amazon River and lower courses of its tributaries.[2] Dianema species have the habit of swimming midwater, as opposed to the bottom as in most callichthyids.[2]


There are currently two described species in this genus:[1]


  1. ^ a b Froese, Rainer, and Daniel Pauly, eds. (2011). Species of Dianema in FishBase. December 2011 version.
  2. ^ a b Reis, Roberto E. (1996-04-29). "Dianema Cope 1872". Tree of Life Web Project. Retrieved 2007-07-12.