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5(3). Case ovoid or bean-shaped, built of secretion incorporating sand, and/or algal filaments; 3 pale slender filaments/gills present on last abdominal segment; ecdysial sutures on head indistinct; tergite (T) on abdominal segment 9 only;
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-Case somewhat rectangular with ends rounded, built of secretion sometimes incorporating sparse sand or algal material; last abdominal segment without pale slender filaments/gills; ecdysial sutures on head distinct; tergites on abdominal segments 1 and 9
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