| Larva |
| - | No tails |
| - | Antennae minute |
| - | No legs; body has the general appearance of a segmented tube |
| - | Instars: 3-4 |
|
 |
| Pupa |
| - | Head, thorax, and wing pads clumped together |
| - | May have filamentous gill fibers on top of thorax |
|
 |
| Adult |
| - | No tails |
| - | Antennae not more than 2-3 times width of head in length |
| - | Only first pair of wings
developed; second pair of wings evolved to short stalks, called halteres |
|
 |
|
True
Flies include (26) aquatic families.
However, chironomids (illustrated above) are of the most interest to trout.
Chironomid larvae have a body with the general appearance of a segmented tube with a
pair of fleshy prolegs at both ends. |