Polygyridae

Polygyridae is a family of terrestrial gastropod mollusks, commonly known as polygyrid snails. They are primarily found in North America, with some species extending into Mexico and Central America. These snails are characterized by their thin, coiled shells, which are typically dextral. The aperture of the shell often has a thickened lip, and in many species, it bears apertural barriers like teeth or lamellae.

Polygyrid snails inhabit a variety of environments, including forests, grasslands, and agricultural areas. They are often found in leaf litter, under logs, or on vegetation. Their diet consists mainly of decaying plant matter, fungi, and sometimes algae. They are hermaphroditic, possessing both male and female reproductive organs, though cross-fertilization is common.

The family Polygyridae is diverse, with numerous genera and species described. Some well-known genera include Polygyra, Triodopsis, and Mesodon. The exact number of species is subject to ongoing research and taxonomic revisions. These snails play a role in their ecosystems as decomposers and as a food source for various predators. Conservation efforts are in place for some species that are considered rare or threatened due to habitat loss and other environmental pressures.