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2(1). Anal gills present at tip of abdomen; IF NO gills are visible then abdominal terga have raised tubercules on each side; last few abdominal segments fused into complete rings Note: Anal gills may be partially or fully contracted so that only the tips are visible or none are visible, respectively
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-Anal gills not obviously present; tubercules absent; abdominal segments 2-9 clearly divided into sternum and tergum Note: Anal gills are concealed inside the abdomen.
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