Pelagic Molluscs 2.0
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Pelagic Molluscs 2.0
Key: Step 2. Text Key

1a. The animal is provided with a calcareous shell.

Step 3. 2

1b. There is no shell, there are only soft parts.

Step 156. 155

1c. There is a shell, but it is hidden in the soft parts (Cardiapoda).

Step 238. 237

1d. There is no calcareous shell, but a cartilaginous slipper-like shell protects part of the soft body (Cymbuliidae).

Step 239. 238
Decision path