We summarize the distribution,ecology, threats, and conservation status of Faxonius marchandi(Hobbs,1948), the Mammoth Spring crayfish, and a limited-range endemic species to the Spring River drainage of Missouri and Arkansas,USA. The species is known from 51 locations on lower-order perennial and intermittent streams in only the eastern portion of the drainage. Faxonius marchandi is found in larger rocky substrates in shallower, slower-velocity habitats of well-buffered, or mineral-rich streams. The invading alien crayfish Faxonius neglectus chaenodactylus (Williams,1952) is the most likely threat to F. marchandi. These compiled data should serve as a baseline for future comparison, and facilitate discussion approximately future management, and conservation,and research efforts.
Source: usgs.gov