Tritogonia verrucosa, the buckhorn (also called pistol grip), is found in the Neartic region. Buckhorns have been documented in the mid and eastern parts of the United States, including: Texas, Pennsylvania, Tennessee, Mississippi, Kentucky, Georgia, Alabama, Minnesota, Missouri, Iowa, Arkansas, Louisiana, Maryland, Oklahoma, Delaware, North Carolina, Ohio, Indiana, Wisconsin, Illinois, West Virginia, and Virginia.

Buckhorn are usually found in medium or large sized rivers where they burrow in sand and gravel substrates. Buckhorn have also been recorded in mud or silt substrates.