Richardsonius

Richardsonius is a genus of freshwater ray-finned fishes belonging to the family Leuciscidae, the shiners, daces and minnows. The fishes in this genus are found in 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.^[2]

Richardsonius Temporal range: Pliocene–present PreꞒ Ꞓ O S D C P T J K Pg N
Redside shiner(Richardsonius balteatus)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cypriniformes
Family:	Leuciscidae
Subfamily:	Pogonichthyinae
Genus:	Richardsonius Girard, 1856[1]
Type species
Cyprinus (Abramis) balteatus Richardson, 1836[1]

Species

Richardsonius contains the following valid species:^[3]

• Richardsonius balteatus (J. Richardson, 1836) (Redside shiner)
• Richardsonius egregius (Girard, 1858) (Lahontan redside)

In addition, a single fossil species †Richardsonius durranti Smith, 1975 is known from the Pliocene-aged Glenns Ferry Formation of Idaho.^[4]