KNOW YOUR BUGS Wyoming has some of the most pristine freshwater habitats in the country, and within them diverse invertebrate communities. No one knows this better than anglers who mimic insect invertebrates to catch world-class trout and other fish in our waters. It may surprise some to learn most of these insects spend the majority of their lives as aquatic larva before hatching onto land. These insects are vital to a strong aquatic system, and some can serve as bioindicators - organisms that reflect the health of an ecosystem. Invertebrates such as mayflies, stoneflies and caddisflies are especially vulnerable to poor environmental conditions such as pollution. Finding a diverse and abundant group of sensitive species in a body of water is usually a sign the aquatic community is healthy and thriving. Here are some examples of the underwater creatures that help to produce the renowned fisheries of Wyoming. - By Stephanie Estell Caddisfly * Anal claws * No tail Mayfly * Two or three tails * Gills on abdomen Stonefly * Two tails * No gills on abdomen Beetle * Hardened wing covers * Obvious head Damselfly * Slender body with three leaf-like tails (gills) * Extendable jaw * Extendable jaw Dragonfly True bug * Stout body with short tail * Leathery cover over wings * Needle-like mouthparts True fly * No jointed legs * May not have an obvious head Photos and information courtesy of the Wyoming Natural Diversity Database. Wyoming Wildlife | 29http://www.uwyo.edu/wyndd/