Macrobenthos of the North Sea - Mollusca
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Macrobenthos of the North Sea - Mollusca
Key: Step 110

Body without ventral furrow (may have mid-ventral line in the anterior part of the middle region); mouth surrounded by foot shield; gills at posterior end bipectinated

Step 111

Body with ventral furrow (may have a dorsal keel); no foot shield around the mouth; gills (when present) foldlike, never bipectinated

Step 112
Decision path