Gastrovascular cavity is not the characteristic feature of

Options

A. Adamsia
B. Aurelia
C. Hydra
D. Cliona

Answer

To solve the question "Gastrovascular cavity is not the characteristic feature of," we will analyze each option provided.

### Step 1: Understand the Definition
The gastrovascular cavity is a primary organ for digestion and circulation found in certain animal phyla. It is primarily associated with organisms in the phyla Cnidaria (e.g., jellyfish, corals) and Platyhelminthes (flatworms).

**Hint:** Remember that the gastrovascular cavity serves both digestive and circulatory functions.

### Step 2: Analyze Each Option
- **Option A: Edensia**
- Edensia is a genus of sea anemones, which belong to the phylum Cnidaria. They possess a gastrovascular cavity for digestion and circulation.

**Hint:** Identify if the organism belongs to Cnidaria or Platyhelminthes.

- **Option B: Aurelia**
- Aurelia is a genus of jellyfish, also part of the phylum Cnidaria. They have a gastrovascular cavity.

**Hint:** Look for common features in jellyfish and sea anemones.

- **Option C: Hydra**
- Hydra is another organism in the phylum Cnidaria. It also has a gastrovascular cavity.

**Hint:** Recall that Hydra is a freshwater organism with similar features to other Cnidarians.

- **Option D: Cliona**
- Cliona is a genus of sponges, which belong to the phylum Porifera. Sponges do not have a gastrovascular cavity; instead, they have a different system for digestion and circulation that relies on water flow through their porous bodies.

**Hint:** Consider the fundamental differences between sponges and organisms with a gastrovascular cavity.

### Step 3: Conclusion
Based on the analysis, the organism that does not have a gastrovascular cavity is **Cliona (Option D)**, as it belongs to the phylum Porifera, which lacks this structure.

### Final Answer
The correct answer is **D. Cliona**.