Crangonyx floridanus

This is the concept of Crangonyx floridanus as redescribed by Cannizzaro et al. (2019). Specimens from Gerard's Cave, Jackson County, Florida, used in the original description of Crangonyx floridanus, are now assigned to C. manubrium. Based on a study of putative C. floridanus from multiple locations across North America, Sawicki et al. (2025) demonstrate that C. floridanus sensu stricto is phylogenetically distinct from all other floridanus complex species and that an undescribed member of the cryptic species complex is the source of nonnative populations. There are possibly other distinct species in the C. floridanus complex (see Sawicki et al. 2025).

This species is widely distributed in the eastern and east-central United States occurring as far west as central Kansas and presumably introduced into western United States and even Japan (Zhang and Holsinger, 2003).

This species is widely distributed in the eastern and east-central United States occurring as far west as central Kansas and presumably introduced into western United States and even Japan (Zhang and Holsinger, 2003).

Zhang and Holsinger (2003) list Alabama (Bibb, Fayette, Greene, Henry, Houston, Jackson, Lauderdale, Lawrence, Madison, Perry, Sumter, Talladega, Tuscaloosa Cos.), Colorado (Boulder, Larimer, Weld Cos.), Florida (Alachua, Baker, Brevard, Clay, Columbia, Dade, Franklin, Hamilton, Highlands, Jackson, Lake, Leon, Levy, Madison, Okaloosa, Seminole, Suwannee, Wakulla Cos.), Georgia (Barrow, Catoosa, Chatham, Clarke, Cobb, Decatur, De Kalb, Lincoln, Meriwether, Polk, Wayne Cos.), Kansas (Pottanatomie Co.), Kentucky (Christian Co.), Maryland (Anne Arundel, Frederick, Montgomery Cos.), Massachusetts (Hampton Co.), Mississippi (Clarke, Forrest, Lafayette, Lauderdale, Rankin, Smith, Winston, Wayne Cos.), Missouri (Butler, Camden, Madison, Scott, St. Louis, Taney Cos.), North Carolina (Carteret, Chatham, Granville, Macon, Moore, Orange, Pamlico, Wake Cos.), Ohio (Wayne Co.), Oregon (Clackamas, Lane Cos.), Pennsylvania (Chester, Dauphin, Lehigh Cos.), Pennsylvania (Chester, Dauphin, Lehigh Cos.), South Carolina (Bamberg, Beaufort, Berkeley, Charleston, Dorchester, Greenville, Jasper, Orangeburg, Richland Cos.), Tennessee (De Kalb, Henry, Loudon, Monroe, Stewart Cos.), Virginia (Fairfax, Montgomery, Pittsylvania, Rockbridge Cos.), West Virginia (Mason Co.), and Washington D.C. It has also been introduced into Colorado and Oregon and California as well as tokyo, Japan.