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Order Plecoptera
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Membranous pleural folds (pf) located laterally on
abdominal segments 1-9 separating sterna from terga; Length of hind wing pads (wp) shorter than twice its greatest width |
Membranous pleural folds (pf) located laterally on
abdominal segments 1-3 or 1-6; Length of hind wing pads (wp) 2-3 times its greatest width |