]> http://projectwatershed.org/taxonomy/term/16/0 en http://projectwatershed.org/caddisfly_larva <a href="caddisfly_larva"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/caddisfly.thumbnail_0.jpeg" width="85" height="100" alt="Caddisfly Larva" title="Caddisfly Larva" /></span> </a><li >Some spin webs to trap food from the flowing water </li> <li >One generation hatches per year </li> <li >Although most species are very sensitive to pollution, some are pollution tolerant </li> <li >Up to 1 1/2 inches long &bull; Very small or no antennae </li> <li >Six segmented legs on upper middle section of body </li> <li >Filamentous gills may be on the end of the body or on the underside</li> Pollution-Intolerant Tue, 2 May 2006 16:28:50 -0400 http://projectwatershed.org/riffle_beetle <a href="riffle_beetle"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/rifflebeetle.thumbnail_0.jpeg" width="98" height="100" alt="Riffle Beetle" title="Riffle Beetle" /></span> </a><li >Adults are considered better indicators of water quality than larvae because they have been subjected to water quality conditions over a longer period </li> <li >Walks very slowly under the water </li> <li >Does not swim on the surface </li> <li >Small oval body </li> <li >1/4&rdquo; long &bull; One pair of tiny antennae</li> Pollution-Intolerant Tue, 2 May 2006 16:26:32 -0400 http://projectwatershed.org/snail <a href="snail"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/snail.thumbnail_0.jpeg" width="48" height="100" alt="Snail" title="Snail" /></span> </a><li >Soft body inside a hard, spiral shaped shell </li> <li >Plate-like door (called the operculum) protects the opening of the shell and can be closed quickly </li> <li >Shells can be seen if you hold the shell with its tip pointing up and the opening facing you</li> Pollution-Intolerant Tue, 2 May 2006 16:25:33 -0400 http://projectwatershed.org/stonefly <a href="stonefly"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/stonefly.jpeg" width="316" height="427" alt="Stonefly" title="Stonefly" /></span> </a><li >About 500 species in North America </li> <li >Are found in cool, clean streams with high levels of dissolved oxygen </li> <li > Develop in the stream for period of three months to three years &bull; Are either predators or feed on fungi and bacteria from rotting leaves </li> <li >Two long antennae </li> <li >Two hair-like tails </li> <li >Gills often located on or behind each leg </li> <li >Six segmented legs on middle section of body </li> <li >Each leg has two hooks on the end</li> Pollution-Intolerant Tue, 2 May 2006 16:23:49 -0400 http://projectwatershed.org/water_penny <a href="water_penny"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/waterpennybeetlelarvae.jpeg" width="327" height="424" alt="Water Penny Beetle Larvae" title="Water Penny Beetle Larvae" /></span> </a><li >The water penny is the aquatic larva of a beetle; the adult of the species is not aquatic </li> <li >The body is often stuck flat to surfaces and looks like a tiny round leaf </li> <li >Round body </li> <li >Segmented plate-like covering </li> <li >Six tiny segmented legs beneath the round body &bull; Color is brown, black or tan</li> Pollution-Intolerant Tue, 2 May 2006 16:22:00 -0400 http://projectwatershed.org/mayfly_nymph <a href="mayfly_nymph"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/mayflynymph.jpeg" width="306" height="431" alt="Mayfly Nymph" title="Mayfly Nymph" /></span> </a><li >About 700 species in North America </li> <li >Develop in the stream during period of two weeks to two years </li> <li > Live on exposed rock surfaces in fast current or buried in soft stream beds </li> <li >Large numbers of flying adults may emerge from stream at the same time </li> <li >Platelike or feathery gills along the side of the abdomen </li> <li >Two or three long hairlike tails </li> <li >Six segmented legs on middle section of body</li> Pollution-Intolerant Tue, 2 May 2006 16:21:11 -0400 http://projectwatershed.org/dobsonfly_larva <a href="dobsonfly_larva"><span class="image thumbnail"><img src="http://projectwatershed.org/uploads/projectwatershed_files/images/dobsonfly.thumbnail_0.jpeg" width="58" height="99" alt="Dobsonfly Larva" title="Dobsonfly Larva" /></span> </a><li >One to four inches long </li> <li >Many fleshy, filamentous appendages on each side of the abdomen </li> <li >Back end is forked with two short tails and two hooks on each tail </li> <li >Gill tufts on the underside of the tail that look like &ldquo;hairy armpits&rdquo; </li> <li >Dark brown to black in color</li> Pollution-Intolerant Tue, 2 May 2006 16:16:47 -0400