Hyphessobrycon ulreyi
 Hyphessobrycon ulreyi commonly known as Ulrey's tetra is a Paraguayan tropical aquarium fish from the Characidae family named in honor of the biologist Albert B. Ulrey. It was originally named Tetragonopterus ulreyi in 1895. Hemigrammus ulreyi is a synonym.This aquarium fish suitable for a community aquarium can reach 5 cm (2 in) in length and does well at temperatures of 21 to 29°C (70 to 85°F).