Cyanogaster geisleri is a species of freshwater ray-finned fish belonging to the family Characidae. This small, transparent fish is found in the Central Amazon, Brazil. It is classified within the glass characin subfamily Aphyocharacinae. It grows to a maximum size of and a weight of . Ths species is found in the river systems of the Amazon and the Orinoco in Brazil, Colombia and Venezuela.
Etymology The specific name honours Dr. Rolf Geisler, aquarist and professor at the University of Freiburg, who collected the holotype and made it available for species description.
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