detailed line drawings of aquatic insects caddisflies stoneflies mayflies dobsonflies dragonflies and damselflies

anatomy aquatic art biodiversity body caddisflies damselflies detailed dobsonflies dragonflies drawings ecological ecosystems educational entomology environmental freshwater guide history identification illustrations importance insect insects invertebrate invertebrates life line mayflies mouthparts natural patterns pond resources river science scientific species stoneflies stream structures studies visual water wing zoology