order
                        
                      
                                    Coleoptera
                                       “Adult Beetles”
                                  
                                    Coleoptera
                                       “Larval Beetles”
                                  
                                    Diptera
                                       “True Flies”
                                  
                                    Ephemeroptera
                                       “Mayflies”
                                  
                                    Hemiptera
                                       “True Bugs”
                                  
                                    Lepidoptera
                                       “Aquatic Caterpillars, Snout Moths”
                                  
                                    Megaloptera
                                       “Alderflies, Dobsonflies, and Fishflies”
                                  
                                    Odonata
                                       “Dragonflies and Damselflies”
                                  
                                    Plecoptera
                                       “Stoneflies”
                                  
                                    Trichoptera
                                       “Caddisflies”
                                 family
                        
                     Perlidae
               
            Acroneuria
            
                  “Common Stoneflies”
               
      Genus Overview
                  
               
                        At least 18 species of Acroneuria occur in North America, living in small streams to large rivers. Mature larvae are engulfing predators, feeding mainly on Chironomidae (Diptera), Ephemeroptera, Plecoptera, and Trichoptera. Adults are unusually vagile, capable of flying long distances, so that they are widely distributed. This is a genus that is often imitated as wet or dry artificial flies by fly fishers.
                  
               Characteristics
                  
               POLLUTION TOLERANCE
                        Southeast: 1.5
                                 Upper Midwest: 0
                                 Midwest: 2.3
                                 Mid-Atlantic: 0
                              0 = least tolerant, 10 = most tolerant
                        FEEDING HABITS
                        
                                 Engulfer / Predator
                        
                     MOVEMENT
                        
                                 Clinger
                        
                     DISTRIBUTION
                        
                                 Widespread (east of the Rocky Mtns.)
                        
                     HABITAT
                        
                                 Lotic-erosional
                        
                     Diagnostic Characters
               order
                         
                                       
                                       
                                    Two Tails
                                  
                                       
                                       
                                    Two Tarsal Claws
                                 family
                         
                                       
                                       
                                    Glossae Shorter Than Paraglossae
                                  
                                       
                                       
                                    Thoracic Gills
                                 genus
                         
                                       
                                       
                                    Occipital Ridge
                                 
                  + Expanded Character List
                  
                     
               
            
                        Order:
                           Wings developing in wing pads. Mouthparts suitable for chewing. Gills digitiform and located near mouthparts, on neck, sides of thorax, or underside of base of abdomen, never on top or sides of abdomen. Two tarsal claws per leg. Only two tails (cerci).
                     
                     
                        Family:
                           Glossae much shorter than the paraglossae. Multi-branched, filamentous gills present laterally and ventrally on thorax, but not on abdomen.
                     
                     
                        Genus:
                           Head with three ocelli, brown, usually with yellow M-shaped pattern anterior to median ocellus. Postocular fringe (fringe of hair around eyes) with close-set row of several thick spinules (small spines). Occiput without conspicuous transverse ridge or row of spinules, except some spinules sparsely present near postocular fringe. Fringe along margins of pronotum well developed, except incomplete laterally. Mesal surfaces of cerci fringed with silky setae, at least basally.
                     
                   
                   
            Dorsal
               Ventral
               


 
                                                
                                             