Mesodon

Mesodon is a genus of North American forest snails. These snails are part of the family Polygyridae, commonly known as the disk snails. The genus Mesodon is characterized by its coiled shells, which are typically globular or depressed and have a distinctive lip around the aperture. The aperture, the opening of the shell, often has a tooth or a series of teeth.

Species within the Mesodon genus are widespread across eastern North America, inhabiting woodlands, forests, and sometimes gardens where there is sufficient moisture and leaf litter for shelter and food. They are primarily herbivorous, feeding on decaying vegetation, fungi, and algae. Mesodon snails are hermaphroditic, possessing both male and female reproductive organs.

The common name "forest snail" reflects their preferred habitat. They play a role in their ecosystems as decomposers, breaking down organic matter. The shells of Mesodon snails can vary in color and size depending on the species and environmental conditions, but they generally exhibit shades of brown or gray. They are a notable component of terrestrial invertebrate biodiversity in their native regions.