Microlaimidae is a family of nematodes belonging to the order Desmodorida.
Species of this family are small, free-living roundworms that typically inhabit marine sediments. They are an important component of benthic communities and contribute to the breakdown of organic matter in coastal and deep-sea ecosystems.
Members of Microlaimidae can be recognized by their slender bodies, smooth cuticle, and simple feeding structures. They mainly feed on bacteria and detritus, playing a role in nutrient cycling and sediment health.