Animals with three primary germinal layers are referred to as ………. .

Explanation

**Step-by-Step Solution:**

1. **Understanding Germinal Layers**: Animals develop from three primary germinal layers during embryonic development. These layers are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer).

2. **Definition of Triploblastic Animals**: Animals that possess all three of these distinct germinal layers are referred to as triploblastic animals. The prefix "tri-" indicates three layers.

3. **Examples of Triploblastic Animals**: Common examples of triploblastic animals include arthropods (like insects and crustaceans), molluscs (like snails and squids), and echinoderms (like starfish and sea urchins).

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