Nothodixa is a member of the dixid midge family. The dixids have small, worm-like larvae that are often bent into a U-shape when live. There are flat, hair-fringed lobes on the last abdominal segment, and the head is often tipped backwards. In Nothodixa there are distinct oval arrangements of fine black hairs on the abdomen.
Nothodixa larvae are found just under the water surface along the margins of small streams.
Dixids use brush like mouthparts to capture drifting food such as algae and other micro-organisms. Nothodixa is also known to feed on organic detritus and oligochaete worms.
Nothodixa are infrequently recorded but they tend to occur in good quality streams. They have moderate to high tolerance values of 4 (hard bottom sites) and 9.3 (soft bottom sites).