.......Superorder Ostariophysi
........Order Characiformes
........Order Cypriniformes—carps
..........Family Catostomldae—suckers
............Genus Carpiodes
.............Species carpio—River carpsucker—Native WYO, SD
.............Species cyprinus—Quillback—Native WYO, SD
............Genus Catostomus
.............Species ardens—Utah sucker—Native WYO
.............Species catostomus—Longnose sucker—Native WYO, SD
.............Species commersoni—White sucker—Native WYO, SD
.............Species discobolus—Bluehead sucker—Native WYO
.............Species latipinnis—Flannelmouth sucker—Native WYO
.............Species platyrhynchus—Mountain sucker—Native WYO, SD
............Genus Cycleptus
.............Species elongatus—Blue sucker—Native SD
............Genus Hypentelium
.............Species nigricans—Northern hogsucker—Native SD
............Genus Ictiobus
.............Species bubalus—Smallmouth buffalo—Native SD
.............Species cyprinellus—Bigmouth buffalo—Native SD
.............Species niger—Black buffalo—Native SD
............Genus Moxostoma
.............Species erythrurum—Golden redhorse—Native SD
.............Species macrolepidotum—Shorthead redhorse—Native WYO, SD
..........Family Cyprinidae—minnows or carps
............Genus Campostoma
.............Species anomalum—Central stoneroller—Native WYO, SD
............Genus Carassius
.............Species auratus—Goldfish—Non-Native WYO, SD
............Genus Couesius
.............Species plumbeus—Lake chub—Native WYO, SD
............Genus Ctenopharyngodon
.............Species idella—Grass carp—Non-Native WYO, SD
............Genus Cyprinella
.............Species lutrensis—Red shiner—Native WYO, SD
............Genus Cyprinus
.............Species carpio—Common carp—Non-Native WYO, SD
............Genus Gila
.............Species atraria—Utah chub—Native WYO
.............Species copei (cf. Snyderichthys copei)—Leatherside chub—Native WYO
.............Species robusta—Roundtail chub—Native WYO
............Genus Hybognathus
.............Species argyritis—Western silvery minnow—Native WYO
.............Species hankinsoni—Brassy minnow—Native WYO, SD
.............Species nuchalis—Mississippi silvery minnow—Native SD
.............Species placitus—Plains minnow—Native WYO, SD
............Genus Luxilus
.............Species cornutus—Common shiner—Native WYO, SD
............Genus Macrhybopsis
.............Species gelida—Sturgeon chub—Native WYO, SD
.............Species meeki—Sicklefin chub—Native SD
.............Species storeriana—Silver chub—Native SD
............Genus Margariscus
.............Species margarita—Pearl dace—Native WYO, SD
............Genus Nocomis
.............Species biguttatus—Hornyhead chub—Native WYO, SD
............Genus Notemigonus
.............Species crysoleucas—golden shiner—Non-Native WYO, Native SD
............Genus Notropis (cf. hybopsis)
.............Species atherinoides—Emerald shiner—Non-Native WYO, Native SD
.............Species blennius—River shiner—Native SD
.............Species dorsalis—Bigmouth shiner—Native WYO, SD
.............Species heterodon—Blackchin shiner—Native SD
.............Species heterolepis—Blacknose shiner—Native SD
.............Species hudsonius—Spottail shiner—Non-Native WYO, Native SD
.............Species rubellus—Rosyface shiner—Native SD
.............Species shumardi—Silverband shiner—Native SD
.............Species stramineus—Sand shiner—Native WYO, Native SD
.............Species topeka—Topeka shiner—Native SD
............Genus Phenacobius
.............Species mirabilis—Suckermouth minnow—Native WYO, SD
............Genus Phoxinus
.............Species eos—northern redbelly dace—Native SD
.............Species neogaeus—Finescale dace—Native WYO, SD
............Genus Pimephales
.............Species notatus—Bluntnose minnow—Native SD
.............Species promelas—Fathead minnow—Native WYO, SD
............Genus Platygobio
.............Species gracilis—Flathead chub—Native WYO, SD
............Genus Rhinichthys
.............Species atratulus—Blacknose dace—Native SD
.............Species cataractae—Longnose dace—Native WYO, SD
.............Species osculus—Speckled dace—Native WYO
............Genus Richardsonius
.............Species balteatus—Redside shiner—Native WYO
............Genus Scardinius
.............Species erythrophthalmus—European rudd—Non-Native SD
............Genus Semotilus
.............Species atromaculatus—Creek chub—Native WYO, SD

........Order Gonorynchiformes
........Order Gymnotiformes
........Order Siluriformes—Catfish
..........Family Ictaluridae—North American freshwater catfishes
............Genus Ameiurus
.............Species melas—Black bullhead—Native WYO, SD
.............Species natalis—Yellow bullhead—Native SD
.............Species nebulosus—Brown bullhead—Native SD
............Genus Ictalurus
.............Species furcatus—Blue catfish—Native SD
.............Species punctatus—Channel catfish—Native WYO, SD
............Genus Noturus
.............Species exilis—Slender madtom—Native SD
.............Species flavus—Stonecat—Native WYO, SD
.............Species gyrinus—Tadpole madtom—Native SD
............Genus Phylodictis
.............Species olivaris—Flathead catfish—Native SD

.......Superorder Osteoglossomorpha
........Order Osteoglossiformes—bony tongues
..........Family Hiodontidae—Mooneyes
............Genus Hiodon
.............Species alosoides—Goldeye—Native WYO, SD
.............Species tergisus—Mooneye—Native SD

.......Superorder Paracanthopterygii
........Order Batrachoidiformes
........Order Gadiformes—Cods
..........Family Lotidae (cf. Gadidae)—Cods, hakes, burbots
............Genus Lota
.............Species lota—Burbot—Native WYO, SD
........Order Lophiiformes
........Order Ophidiiformes
........Order Percopsiformes
........Suborder Percopsoidei
..........Family Percopsidae—Trout-perch
............Genus Percopsis
.............Species omiscomaycus—Trout-perch—Native SD

.......Superorder Polymixiomorpha
........Order Polymixiiformes
........Order Ctenothrissiformes (uncertain position)

.......Superorder Protacanthopterygii
........Order Esociformes—Pikes
..........Family Esocidae—Pikes
............Genus Esox
.............Species lucius—Northern pike—Non-Native WYO, Native SD
.............Species masquinongy—Muskellunge—Non-Native SD
........Order Osmeriformes—Smelt
..........Family Osmeridae—Smelt
............Genus Osmerus
.............Species mordax—Atlantic rainbow smelt—Non-Native SD
........Order Salmoniformes

.......Superorder Scopelomorpha
........Order Myctophiformes

.......Superorder Stenopterygii
........Order Ateleopodiformes
........Order Stomiiformes