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
                        
                     Pteronarcyidae
               
            genus
                     Pteronarcys
            
                  “Giant Stoneflies”
               
      Genus Overview
                  
               
                        8 species in North America. Occur in various stream types.  Very large stonefly that looks archaic and prehistoric.  Common name is salmonfly. 
                  
               Characteristics
                  
               POLLUTION TOLERANCE
                        Southeast: 1.7
                                 Midwest: 2.2
                              0 = least tolerant, 10 = most tolerant
                        FEEDING HABITS
                        
                                 Engulfer / Predator
Scraper / Grazer
Shredder / Detritivore
Shredder / Herbivore
                        
                     Scraper / Grazer
Shredder / Detritivore
Shredder / Herbivore
MOVEMENT
                        
                                 Clinger
Sprawler
                        
                     Sprawler
DISTRIBUTION
                        
                                 Widespread (east of the Rocky Mtns.)
                        
                     HABITAT
                        
                                 Lotic-depositional
Lotic-erosional
                        
                     Lotic-erosional
Diagnostic Characters
               order
                         
                                       
                                       
                                    Two Tails
                                  
                                       
                                       
                                    Two Tarsal Claws
                                 family
                         
                                       
                                       
                                    Gill Tufts on Thorax and Abdomen
                                  
                                       
                                       
                                    Paraglossae And Glossae Subequal
                                 
                  + 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:
                           The body is dark and can be quite large (up to 2 inches), with profusely branching gills under the thorax and basal abdominal segments; the wing pads are divergent.
                     
                     
                        Genus:
                           Large stonefly, lateral projections on abdominal segments, gill tufts under thoracic segments and 1st two segments.
                     
                   
                   
            Dorsal
               Ventral
               


 
                                                
                                             