46a (45a).    Prehensile labium (= lower lip), folded under head at rest, and when extended much

                   longer than head (Figs.A-G) [dragonfly and damselfly nymphs]..................…................Odonata

 

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                                A                                               B                                     C                                            D

 

                         

                                         E                                  F                                                 G

 

 

 

46b.    Labium normal, not as previously described...............................................................…….................. .47