Macrobenthos of the North Sea - Mollusca
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Macrobenthos of the North Sea - Mollusca
Key: Step 1

Animal without a visible external shell

Step 2

External shell consists of one single structure

Step 113

External shell bivalved (rarely with some accessoric shell-parts); the two valves hinge along one edge

Step 322

External shell consists of 8 overlapping shell valves, encircled by a soft, uncalcified skirt

Step 481
Decision path