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3(2). Free-swimming and retreat making larvae, never constructing portable cases; 1st abdominal segment (Ab1) not modified; abdominal prolegs well developed, elongate with a terminal anal claw Note: Larvae often fall out of their cases in death, so it is important to look at the listed body features when a larva has no case.
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-Case making larvae with cases constructed of silk, sand, plant pieces or hollowed stem; 1st abdominal segment usually modified with dorsal (DH) and/or lateral humps (LH); abdominal prolegs fused; anal claws either small and lateral or apical Note: Larvae often fall out of their cases in death, so it is important to look at the listed body features when a larva has no case. 
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