Subanguina graminophila is a plant-pathogenic nematode. It forms galls on the leaves of grasses. It is known from grasses in the genera Agrostis (the main host), Bromus, and Calamagrostis. It has been found at a range of elevations, from sea level to at least 405m elevation, in a variety of habitats including brackish grassland above saltmarsh, semi-improved grassland, and heath.