IUCN threat status:

Data Deficient (DD)

Distribution

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Global Range: (5000-200,000 square km (about 2000-80,000 square miles)) The species was generally considered endemic to the Ozark and Ouachita mountain ranges of the interior highlands west of the Mississippi River. It is known historically from the Little Missouri, Saline, Caddo and Ouachita Rivers (Red River drainage); Spring, Elk, Fall, Caney, Neosho, Verdigris and Shoal Rivers (Arkansas River drainage); Little Black, Black, Buffalo, Current, Spring, Strawberry, and White Rivers, and Cane and Castor Creeks (White River drainage); and the St. Francis River. The species is now extirpated from the Caney, Elk and Neosho rivers (Obermeyer et al., 1997; Vaughn, 1998; Couch, 1997), the Oklahoma portion of the Verdigris and Spring rivers (Vaughn, 1998), and from Castor and Cane Creeks, Missouri (Oesch, 1995). The population in the Little Black River is not viable, although some adults still exist in a Missouri reach (Bruenderman, pers. com.). Occurrences in Arkansas are more viable with populations in at least 8 rivers and locally abundant in 2 or 3 (Harris et al., 1997). It was recently collected in the Saline River, Arkansas, after several years of supposed absence (Davidson and Gosse, 2003). Archaeological remains exist on Big Sunflower and Yazoo Rivers in Mississippi, but no extant populations (Jones et al., 2005). It has recently been suggested that C. aberti is not a monophyletic group and may comprise 2 and possibly 5 distinct taxa, one of which includes the federally endangered Cyprogenia stegaria (Serb, 2003; 2006; Serb and Barnhart, 2008); with only Arkansas populations representing true C. aberti (see Element Management).

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