The Brown Dun (Ameletus sp.) made its appearance on Super Bowl Sunday.

Ameletus nymphs are exceptional swimmers as their streamlined body and long tails allude to. When mature they can be over a half inch long. Note the short antennae and dark band at the base of the tails: two excellent identification traits.

The broad, flat shape of March Brown nymphs is distinctly different than the slender torpedo-shape of Ameletus nymphs.

The horizontal dark bands on top of the abdominal segments are characteristic of Ameletus duns, and provide the best clue to distinguish them from Western March Brown duns.