Pupilliidae

Pupillidae is a family of small land snails in the superfamily Pupilloidea. They are terrestrial pulmonate gastropods, typically minute to a few millimeters in height. Shells are usually conical to cylindrical, with a high spire and a narrow or closed umbilicus; the aperture is simple, though some species show an internal tooth or lamella along the lip. As with most pulmonates, Pupillidae lack an operculum.

These snails inhabit leaf litter, moss, calcareous soils, rock crevices, and sometimes caves, in a wide range of habitats across temperate regions of Europe, Asia, Africa, the Americas, and on various islands. They are generally detritivores or micro-grazers, feeding on biofilm, fungi, and decaying plant matter. Their small size makes them easily overlooked in field surveys, but they can be common components of microhabitats with stable moisture.

Taxonomy within Pupillidae has undergone revisions, with several genera described and reclassified as new morphological and molecular data become available. The type genus is Pupilla, and the family comprises multiple other genera. Species are typically micromollusks, contributing to local biodiversity and ecological processes in their microhabitats.

Fossil records show Pupillidae in the Cenozoic, with numerous extinct genera described from Miocene to Pleistocene deposits. This paleontological record supports studies of biogeography and climate change in past ecosystems.

Conservation considerations reflect their specialized microhabitats; many species have restricted ranges and are sensitive to habitat disturbance, making them useful indicators of litter and soil health in their native environments.