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
                        
                     Leptohyphidae
               
            genus
                     Tricorythodes
            
                  “Little Stout Crawler Mayflies”
               
      Genus Overview
                  
               
                        There are 13 North American species in this genus. Larvae and adults are small, requiring fly fishers to tie their imitations of "trichos" on small hooks (size 22–26, depending on the species). Larvae sprawl on sediments in lotic-depositional and lentic-littoral habitats, or cling to stable substrates in those habitats. They feed as collectors-gatherers of tiny fragments of organic matter, occasionally scraping algae, diatoms, and other biofilm from stable substrates.
                  
               Characteristics
                  
               POLLUTION TOLERANCE
                        No pollution tolerance ranges defined.
                        FEEDING HABITS
                        
                                 Collector / Gatherer
Scraper / Grazer
                        
                     Scraper / Grazer
MOVEMENT
                        
                                 Clinger
Sprawler
                        
                     Sprawler
DISTRIBUTION
                        
                                 Widespread (east of the Rocky Mtns.)
                        
                     HABITAT
                        
                                 Lentic-littoral
Lotic-depositional
                        
                     Lotic-depositional
Diagnostic Characters
               order
                         
                                       
                                       
                                    Abdominal Gills
                                  
                                       
                                       
                                    Single Tarsal Claw
                                  
                                       
                                       
                                    Usually 3 Tails
                                 family
                         
                                       
                                       
                                    Operculate Gill On 2
                                 
                  + Expanded Character List
                  
                     
               
            
                        Order:
                           Wings developing in wing pads. Mouthparts suitable for chewing. Gills present on tops and sides of abdomen. Segmented legs present. One tarsal claw per leg. Usually with 3 tails (sometimes 2).
                     
                     
                        Family:
                           The gills on abdominal segment 2 are operculate or semioperculate, roughly triangular or oval, and not touching or fusing medially. Abdominal segments 3–6 with lamelliform (plate-like) portion of gills simple or with two lobes, never with fringed margins.
                     
                     
                        Genus:
                           Head not wider than pronotum, without frontoclypeal or genal projections, males with small eyes. Submentum outer apical margins with long setae. Dorsal surfaces of femora without spatulate setae. Tarsal claws with many tiny teeth in one row along basal edge. Length of hind femora only about 1/2 to 3/4 the length of hind tibiae and tarsi. Hind wing pads absent. Dorsally, abdominal segments 1–6 without little spines along posterior edges.
                     
                   
                   
            Dorsal
               Ventral
               


