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Richardsonius balteatus.jpg
Richardsonius balteatus hydrophloe
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Subfamily: Leuciscinae
Genus: Richardsonius
Girard, 1856
Type species
Cyprinus (Abramis) balteatus
Richardson, 1836

Richardsonius is a genus of cyprinid fish consisting of two species native to western North America. Commonly known as redside shiners, that term is also used to refer to Richardsonius balteatus specifically. The genus is named after naturalist Sir John Richardson (1787–1865), who described R. balteatus in 1836.