09/08/2026
Iowa's September Endangered Species of the Month is the Buckhorn Mussel, also commonly called a pistolgrip.
Buckhorns are usually found burrowed in the sand or gravel of rivers. They breed once a year in spring, and their age can be measured by internal growth rings, but it is not yet known how long their lifespan is officially. For now, we know that specimens have been recorded up to 70 years old.
Once the juvenile mussel settles down, they may only move up to a few meters over the course of their lives. They extract nutrients and oxygen from detritus and water through their incurrent siphon, discharging waste products through their excurrent siphon.
Fun facts: Buckhorns were once used in large numbers for making pearl buttons for clothing, their shells have been used to seed marine oysters to grow valuable pearls.
Learn more at:
https://animaldiversity.org/accounts/Tritogonia_verrucosa/