Kansas: Allen: Petrolia (KKA). Barber: 7 mi. S Sun City. Butler: 3 mi. SE Augusta (Burt and Hoyle, 1934:198). Chase: 10 mi. SW Olpe; 7 mi. SW Saffordville (Breukelman and Smith, 1946:112). Cherokee: tributary of Spring River, 1 mi. N Riverton (Hall and Smith, 1947:451). Coffey: (Smith, 1956:160, symbol on map). Cowley: 11 mi. SE Winfield (Stejneger, 1944:55). Crawford: Pittsburg (Hall and Smith, loc. cit.). Doniphan: "near" Geary (Linsdale, 1927:81). Elk: (Smith, loc. cit.). Ellis: Big Creek (Brennan, 1934:190); Ellis (Conant and Goin, 1948:2). Franklin: Middle Creek, SE part of county (Gloyd, 1928:135). Greenwood: (Stejneger, op. cit.:54). Leavenworth: Missouri River "near" Fort Leavenworth (Brumwell, 1951:208). Lyon: 5 mi. E Emporia (Breukelman and Smith, loc. cit.). Marion: (Smith, loc. cit.). Meade: Meade County State Park, ca. 13 mi. SW Meade (Tihen [502] and Sprague, 1939:505). Ness: 5.5 mi. NW Ness (Breukelman and Smith, loc. cit.). Osage: Marais des Cygnes River; Long and Jordan Creeks (Clarke, 1958:21). Reno: 6 mi. E Turon. Sedgwick: 2 mi. NE Cheney (Burt, 1935:321). Sheridan: State Lake 7 mi. NE Quinter, Gove County (Breukelman and Smith, loc. cit.). Wabaunsee: Dragoon Creek at Harveyville (Clarke, 1956:215). Wallace: (Burt, 1933:208). Wilson: Fall River, 1/2 mi. S Neodesha (Clarke, loc. cit.).
Minnesota: Anoka: Benton: Chisago: (Breckenridge, 1944:184, symbols on map). Crow Wing: (Breckenridge, op. cit.:185). Dakota: (Hedrick and Holmes, 1956:126). Goodhue: (Breckenridge, op. cit.:184, symbol on map). Hennepin: Minneapolis; Lake Minnetonka (Breckenridge, op. cit.:187); 5 mi. N. Minneapolis (Breckenridge, 1955:5). Houston: Root River near Hokah. Lesueur: Lake Washington (Hedrick and Holmes, loc. cit.). Meeker: Swan Lake (Breckenridge, 1957:232). Pine: (Breckenridge, 1944:185). Ramsey: Rice: Sherburne: Stearns: (Breckenridge, op. cit.:184, symbols on map). Washington: just north of Stillwater (Hedrick and Holmes, loc. cit.). Winona: Winona (Breckenridge, op. cit.:187). Yellow Medicine: (Breckenridge, op. cit.:185). County unknown (Goodhue or Wabasha): Lake Pepin (Breckenridge, op. cit.:184).
Missouri: Boone: east of Ashland (Henning, 1938:92). Jackson: Missouri River "near" Atherton (Anderson, 1942:219). Jefferson: Mississippi River "near" mouth Glaize Creek at Sulphur Springs; Glaize Creek at Barnhart (Boyer and Heinze, 1934:199). St. Clair: Osage River "near" Osceola. Vernon: Marmaton River, 7 mi. N Moundville (Conant and Goin, 1948:9).
Montana: Yellowstone River (Conant and Goin, 1948:9).
Nebraska: Adams: 1 mi. N Ayr (Hudson, 1942:101). Dawson: 2 mi. SE Gothenburg (Gehlbach and Collette, 1959:142). Franklin: 2 mi. SW Naponee. Gage: 1 mi. W Barnston. Hitchcock: 3 mi. E Stratton. Holt: Elkhorn River "near" Atkinson. Lancaster: Lincoln (Hudson, loc. cit.). Lincoln: 1 mi. S Sutherland (Gehlbach and Collette, loc. cit.). Red Willow: 14 mi. NW McCook. Richardson: 2 mi. S Rulo. Wheeler: 2 mi. W Ericson (Hudson, loc. cit.).
Oklahoma: LeFlore: Wister (Conant and Goin, 1948:9); Shady Pointe (KKA); Poteau River, 6.5 mi. W Heavener (Trowbridge, 1937:301). Tulsa: Arkansas River "near" Tulsa (Force, 1930:38).
Wyoming: Goshen: Platte River (Conant and Goin, 1948:10).
Trionyx spinifer asper (Agassiz)
Gulf Coast Spiny Softshell
Aspidonectes asper Agassiz, Contr. Nat. Hist. United States, 1(Pt. 2):405; 2(Pt. 3):pl. 6, fig. 3, 1857.