Anguispira knoxensis

Rustic tigersnails are described as having a larger, more robust shell than Anguispira alternata marked by small, fine riblets.^[3][4] The entire shell is covered with a secondary structure of fine wrinkles, almost invisible to the naked eye, but that give the shell a 'dull' appearance compared to other Anguispira species.^[3] It is described as rusty brown in color with inconspicuous flame-like markings. The shell ranges from 23 to 25 mm in diameter.^[3]

The rustic tigersnail can currently be found in three counties in Tennessee: Monroe, Blount, and Knox Counties.^[5] Additionally, a population was historically recorded around Hazel Creek in North Carolina; the species is now considered likely extirpated from the state.^[1]

The rustic tigersnail can be found in or around large, rotting hardwood logs in advanced stages of decay, in leaf mold, or in soil. They are typically found near limestone outcrops.^[4][6]

Due to the species' limited range the difficulty of locating new populations, the rustic tigersnail is listed as critically imperiled in Tennessee.^[1][2]