Pustulosa pustulosa

Neemuchwala et al. (2023) designated Cyclonaias a monotypic genus consisting of the type species C. tuberculata and resurrected the oldest available generic epithet, Pustulosa, to represent the clade consisting of P. infucata, P. kieneriana, P. kleiniana, P. necki, P. nodulata, P. petrina, P. pustulosa, and P. succissa.

Based on genetic and morphological analyses, Johnson et al. (2018) synonymized Cyclonaias aurea, C. houstonensis, C. mortoni, and C. refulgens with Cyclonaias pustulosa.

Williams et al. (2017) transferred to the genus Cyclonaias and elevated subspecies mortoni to species status. Graf and Cummings (2007) previous moved the genus from Quadrula to Amphinaias.

This is a widespread and common species in North America with stable populations throughout its range with the exception of perhaps the northeastern occurrences from New York to West Virginia.

This species is known from the eastern reaches of the Great Lakes, Lake St. Clair and Lake Erie, and widespread throughout the Mississippi Basin from southern Minnesota south to Louisiana, and from western New York west to South Dakota; also the Gulf Coast rivers from the Pascagoula Basin in Mississippi west to the Nueces Basin in southwest Texas (Johnson et al. 2018).

In Minnesota, it is widespread and common in the St. Croix drainage and Mississippi River below St. Anthony Falls; uncommon to rare in the Minnesota River (Sietman, 2003). It is widespread and abundant in S Wisconsin in large rivers and part of NE (Mathiak, 1979). It is in the Kalamazoo (Mulcrone and Mehlne, 2001), Lake Michigan and St. Croix/Detroit drainage in Michigan (Strayer, 1980; Badra and Goforth, 2003). In Illinois, it is in most drainages; locally abundant (Cummings and Mayer, 1997; Schanzle and Cummings, 1991); Fox in Illinois and Wisconsin (Schanzle et al., 2004), Rock (Tiemann et al., 2005). Indiana distribution: Tippecanoe (Cummings and Berlocher, 1990), E Fork White (Harmon, 1992), Muscatatuck (Harmon, 1989), St. Joseph, St. Mary's and Maumee (Pryor, 2005). In Ohio, it is widespread except Great Miami (Watters, 1992; 1995; Hoggarth et al., 2007; Watters et al., 2009). In West Virginia, it is in the Upper Ohio/Kanawha (Zeto et al., 1987; Morris and Taylor, 1992). In Mississippi, it is in the Mississippi River N and S, Big Black, Yazoo, and Tennessee drainages (Jones et al., 2005). In Louisiana, it is common and widely distributed in the Mississippi River and tributaries (Vidrine, 1993). It was found in Ouachita (Posey, 1997), St. Francis (Ahlstedt and Jenkinson, 1991), Poteau (Vaughn and Spooner, 2004), Cache and White Rivers, Arkansas (Christian, 1995; Christian et al., 2005; Gordon, 1982; Gordon et al., 1994); and lower Arkansas (Gordon, 1985). In North Carolina, it is questionable (extirpated?) because Lea described U. pernodosus from North Carolina and Ortmann (1918) considers it a possible synonym (Bogan, 2002). Oklahoma: Poteau River, Lake Texoma, Illinois and Mountain Fork (Spooner and Vaughn, 2007) rivers, Spring (Branson, 1966), Red, Washita, Blue, Boggy, Kiamichi, Little (Vaughn and Taylor, 1999), Arkansas, Verdigris (Boeckman and Bidwell, 2008), Neosho, Poteau and Chikaskia rivers, and Cache Creek, Chikaskia River, and "Oklahoma City" (Branson, 1982; Vaughn, 2000). In Texas, it is in the Brazos River into the N and E but as mortoni (valid species?) (Howells et al., 1996); indicating actual pustulosa in only far E Texas. Subspecies mortoni was found across Village Creek drainage (Hardin, Tyler, Polk Cos.) (Bordelon and Harrel, 2004). In Kansas, it is in all drainages in the eastern third (Couch, 1997; Tiemann, 2006); incl. Spring (Branson, 1966). In the Little Blue River basin it is as weathered shells in Nebraska and one recent shell in Kansas (Hoke, 2004). In the Big Blue system of SE Nebraska and NE Kansas it was relatively common in Nebraska and rare in creeks in the E Nebraska reaches of the Little Blue basin, shells in Kansas portion in poor condition with only one live individual (Hoke, 2005). It is in the James River, South Dakota (Perkins and Backlund, 2003) with dead shells in the Big Sioux (Skadsen and Perkins, 2000). In Tennessee, it is in the majority of medium to large rivers throughout the state, from the Hatchie River in W Tennessee to the upper Clinch, Powell, Holston, and Nolichucky Rivers in E Tennessee (Parmalee and Bogan, 1998). In Alabama, it is common and restricted to the Tennessee River system (Mirarchi, 2004) across N Alabama including tributaries (Elk, Paint Rock Rivers, Bear Creek- McGregor and Garner, 2004) (Ahlstedt, 1996; Williams et al., 2008). It has been collected in Kentucky in the Middle Green (Gordon, 1991), South Fork Kentucky (Evans, 2008) and Barren Rivers (Cochran and Layzer, 1993), but is generally distributed statewide (Cicerello and Schuster, 2003). In Canada, this species has a limited distribution in Lake Erie, Lake St. Clair, Niagara River, and the lower reaches of the Grand, Thames, and Sydenham Rivers in southwestern Ontario (Metcalfe-Smith and Cudmore-Vokey, 2004; Metcalfe-Smith et al., 2003).