Which is trait is not characteristic of echinodermata ?

Options

A. Aristotle's lantern
B. Water vascular system
C. Radial and indeterminate cleavage
D. Trochophore larva.

Answer

To determine which trait is not characteristic of Echinodermata, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Echinodermata Characteristics**:
Echinoderms are a group of marine animals that include sea stars, sea urchins, and sea cucumbers. They are known for certain key characteristics.

2. **Evaluate the Options**:
- **Aristotle's Lantern**: This is a structure found in sea urchins, which are echinoderms. It is used for feeding. Therefore, this is a characteristic of Echinodermata.
- **Water Vascular System**: This is a unique feature of echinoderms that aids in locomotion, feeding, and respiration. It is a defining characteristic of the phylum Echinodermata.
- **Radial and Indeterminate Cleavage**: Echinoderms exhibit radial cleavage during embryonic development, which is a characteristic of this group. Indeterminate cleavage means that the fate of the cells is not determined early in development, which is also typical for echinoderms.
- **Trochophore Larva**: This type of larva is characteristic of mollusks and some annelids, not echinoderms. Echinoderms typically have a different larval form, such as the bipinnaria or brachiolaria larva.

3. **Identify the Incorrect Trait**:
Based on the analysis above, the trait that is not characteristic of Echinodermata is the **Trochophore larva**.

### Conclusion:
The correct answer to the question is **Trochophore larva**.

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