Limnephilus marmoratus is marbled, but there are no spots you can actually pin point, like the moon in the tip of the wing of Limnephilus lunatus. It usually is more strongly marked than the similar Limnephilus rhombicus. Striking is the white spot on top of the head. Even though more species do have this white spot, it is very striking in Limnephilus marmoratus. The wing measures 12 to 17 mm and adults appear from May to October, peaking in June and August. The larvae eat Water-startwort and are usually found on Common Water-starwort and Lesser Duckweed. A common species in most of the British Isles.