genus
Faxonius
Faxonius
Field notes
Faxonius is a genus of freshwater crayfish in the family Cambaridae. There are more than 90 described species in Faxonius. It includes the rusty crayfish, an invasive species in North America, and three species, F. virilis, F. immunis, and F. limosus, that are invasive to Europe.
This genus was formerly considered a subgenus of Orconectes. Several former Orconectes species were added to this genus in 2017, leaving only the cave dwelling species unchanged.
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- Faxonius palmeri 3 native
- Faxonius difficilis 2 native
- Virile Crayfish present
- Rusty Crayfish present
- Northern Clearwater Crayfish presumed native
- Spinycheek Crayfish presumed native
- Calico Crayfish present
- Ringed Crayfish native
- Allegheny Crayfish native
- Bigclaw Crayfish presumed native
- Golden Crayfish native
- Rusty × Northern Clearwater Crayfish
- Spiny Stream Crayfish presumed native
- Saddle Crayfish presumed native
- Spothanded Crayfish presumed native
- Slender Crayfish presumed native
- Ozark Crayfish
- Longpincered Crayfish presumed native
- Meek's Crayfish presumed native
- Water Nymph Crayfish native
- Redspotted Stream Crayfish presumed native
- Reticulate Crayfish presumed native
- Sloan's Crayfish presumed native
- Neosho Midget Crayfish native
Range
Greener is more native, amber more introduced; paler is less certain. How this was decided
Most observed native Faxonius All
Native to the US, by observations.
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Ringed Crayfish
Faxonius neglectus
975 observations
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Allegheny Crayfish
Faxonius obscurus
869 observations
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Golden Crayfish
Faxonius luteus
515 observations
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Water Nymph Crayfish
Faxonius nais
133 observations
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Neosho Midget Crayfish
Faxonius macrus
76 observations
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Woodland Crayfish
Faxonius hylas
39 observations
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Nashville Crayfish
Faxonius shoupi
27 observations
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Saddleback Crayfish
Faxonius medius
24 observations
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Spring River Crayfish
Faxonius roberti
7 observations
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Coldwater Crayfish
Faxonius eupunctus
6 observations
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Crescent Crayfish
Faxonius taylori
3 observations
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Yazoo Crayfish
Faxonius hartfieldi
3 observations
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Eleven Point River Crayfish
Faxonius wagneri
2 observations
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MoWild Crayfish
Faxonius elix
1 observations