42a
(41b). Abdomen with 3 long
thread-like caudal filaments and with style-like appendages on
some abdominal segments (Fig.A); mouthparts
mandibulate, but often somewhat
retracted
into head; body almost always covered with scales; terrestrial
[bristletails].…...….. 43
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A
42b. Abdomen with only 2
thread-like caudal filaments or none; if with 3 [mayfly nymphs]
then aquatic;
other characters variable...............................................................................………....... 44
