Major Groups | Insecta (insects) | Trichoptera (caddisflies) | Hydroptilidae |
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2(1). Body slightly compressed dorsoventrally; abdominal segment 2 (ab2) swollen to form paired lateral protuberances (LP); case wheat seed-shaped, built of secretion only
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-Body slightly compressed laterally; abdominal segments gradually increasing in size, segment 2 not swollen; case usually purse-shaped, materials variable
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