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CRUSTACEA OF ILLINOIS
- Class Malacostraca
- Order Isopoda
- Suborder Oniscoidea: Terrestrial Isopods (pillbugs)
- Family Armadillidiidae
- Armadillidium vulgare I
- Family Trachelipodidae
- Trachelipus rathkei I
- Suborder Asellota: Aquatic Isopods
- Family Asellidae
- Caecidotea beattyi
- Caecidotea brevicauda
- Caecidotea dentadactylus
- Caecidotea forbesi
- Caecidotea intermedia
- Caecidotea kendeighi
- Caecidotea laticaudatus
- Caecidotea meisterae
- Caecidotea packardi
- Caecidotea lesliei SE
- Caecidotea spatulata SE
- Caecidotea stygia
- Caecidotea whitei
- Caecidotea sp.
- Lirceus fontinalis
- Lirceus garmani
- Lirceus lineatus
- Lirceus louisianae
- Order Amphipoda: scuds
- Family Crangonyctidae
- Bactrurus brachycaudus
- Bactrurus mucronatus
- Crangonyx anomalus SE
- Crangonyx antennatus SE
- Crangonyx forbesi
- Crangonyx gracilis
- Crangonyx minor
- Crangonyx pseudogracilis
- Crangonyx richmondensis
- Crangonyx sp.
- Synurella bifurca
- Synurella dentata
- Family Gammaridae
- Apocrangonyx lucifugus
- Apocrangonyx subtilis
- Stygobromus iowae SE
- Stygobromus subtilis - Subtle Cave Amphipod WL
- Gammarus acherondytes - Illinois Cave Amphipod SE, FE
- Gammarus bousfieldi - Bousfield's Amphipod ST
- Gammarus fasciatus
- Gammarus minus
- Gammarus pseudolimnaeus
- Gammarus troglophilus
- Family Hyalellidae
- Hyalella azteca
- Family Pontoporeiidae
- Monoporeia affinis
- Order Decapoda: crayfish
- Family Palaemonidae
- Macrobrachium ohione- Ohio shrimp
- Palaemonetes kadiakensis - Mississippi grass shrimp
- Family Cambaridae
- Subfamily Cambarellinae
- Cambarellus puer
- Cambarellus shufeldtii - Cajun dwarf crayfish
- Subfamily Cambarinae
- Procambarus acutus
- Procambarus clarkii - red swamp crayfish
- Procambarus gracilis - prairie crayfish
- Procambarus viaeviridis
- Orconectes illinoiensis
- Orconectes immunis - calico crayfish
- Orconectes indianensis SE
- Orconectes kentuckiensis SE
- Orconectes lancifer - oxbow crayfish SE
- Orconectes luteus
- Orconectes placidus SE
- Orconectes propinquus - northern clearwater crayfish
- Orconectes rusticus - rusty crayfish I
- Orconectes stannardi
- Orconectes virilis - virile crayfish
- Fallicambarus fodiens
- Cambarus diogenes - devil crawfish
- Cambarus robustus X
- Cambarus rusticiformis
- Cambarus tenebrosus
X = Extirpated from Illinois
FE = Federally Endangered
SE = Illinois State Endangered
ST = Illinois State Threatened
WL = Illinois Watch List
I = Introduced