Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 21 - 300
Comments: In Idaho, it is uncommon and occurs generally in the northern part of the state (Frest and Johannes, 2000). Neck (1990) documented this species in a playa in Randall Co., in the Texas panhandle. Records in Texas are also known from Hunt and Fayette Cos. (Fullington, 1978). Sublette and Sublette (1967) reported Fossaria bulimoides from three to nine playas surveyed on the Southern High Plains of Texas and New Mexico but these may likely be Fossaria cockerelli (taxonomic confusion exists between these two species) which falls more within the geographic range covered in this report than F. bulimoides. New Mexico records are known from close to the Texas panhandle in Grant (Valencia Co.) and Las Vegas (San Miguel Co.) (Bequaert and Miller, 1973). It is known from the Late Cenozoic in Texas (Late Pleistocene of Red River northwest of Denison in Grayson Co.), New Mexico (see Baker, 1911), Kansas (Berry and Miller, 1966) and the Oregon-Idaho border (Taylor, 1966) (see Bequaert and Miller, 1973). Populations are also known in Arizona in Cow Lake (Maricopa Co.), Dogtown Wash and Spitz Spring (Coconino Co.), Holbrook, north of Winslow, south of Snowflake, and west of Joseph City (all Navajo Co.), and west of Ganado (Apache Co. (Bequaert and Miller, 1973). In addition, thriving colonies of both F. cockerelli and F. techella occur sympatrically in the same pond at two stations in Navajo Co, Arizona (Bequaert and Miller, 1973). Records from Pilsbry and Ferriss (1915) as riparian drift of the Santa Cruz River (Tucson) and San Pedro River (Benson) are doubtful as Bequaert and Miller (1973) found only F. techella in drift there (see Bequaert and Miller, 1973). Also records from Rio Yaqui, north of Ciudad Obregon, Sonora (Mexico) said by Branson et al. (1964) to be cockerelli are likely F. techella (see Bequaert and Miller, 1973). Lepitzki (2001) includes this species as a morph of Fossaria bulimoides but notes several morphs (F. bulimoides, F. cockerelli, F. technella, and F. perplexa) occur in Alberta near Fort Macleod and the Little Bow River (Taylor, 1895); 14 known sites along the Saskatchewan and Mackenzie River systems (Clarke, 1973); and near Sheep River (Boag and Wishart, 1982).