THE PRESENCE OF CADDISFLY AND MAYFLY LARVAE INDICATE HIGH LEVELS OF DISSOLVED OXYGEN AND GOOD WATER QUALITY

CADDISFLY

FIG. 3 Case and larva of Ochrotrichia unio. (From Illinois Natural History Survey.)

Figure 4 Caddisfly larva. (From McCafferty 1983)

MAYFLY

 

Mayfly larvae are distinguished by:

  • Plate-like, filamentous or feathery gills along side of abdomen (the infrequently found armored mayflies (Family Baetiscidae) have gills)

    Figure 5 Two-tailed and three-tailed mayflies (From McCafferty 1983)

    Figure 6 Burrowing mayfly.

    (From McCafferty 1983)

    Figure 7 Armored mayfly.

    (From McCafferty 1983)

    images from Save Our Streams Monitor's Guide to Aquatic Macroinvertebrates Loren Larkin Kellogg, Izaak Walton League