Which of the following is not a connecting link?

Options

A. Neopilina
B. Peripatus
C. Latimeria
D. Limulus

Answer

To determine which of the following is not a connecting link, we need to analyze each option provided:

1. **Neopelina**: Neopelina is known to be a connecting link between annelids (segmented worms) and molluscs (soft-bodied animals). It exhibits characteristics of both groups, making it a significant evolutionary link.

2. **Peripetus**: Peripetus serves as a connecting link between annelids and arthropods (insects, arachnids, and crustaceans). It shares features of both groups, thus qualifying as a connecting link.

3. **Latimeria**: Latimeria, also known as coelacanth, is a connecting link between amphibians and fishes. It has traits that are characteristic of both groups, which makes it an important evolutionary link.

4. **Limulus**: Limulus, commonly known as the horseshoe crab, is not considered a connecting link. Instead, it is classified as a living fossil, meaning it has remained relatively unchanged over millions of years and does not serve as a transitional form between different groups.

Based on this analysis, the answer to the question "Which of the following is not a connecting link?" is **Limulus**.

### Summary of the Solution:
- Neopelina: Connecting link between annelids and molluscs.
- Peripetus: Connecting link between annelids and arthropods.
- Latimeria: Connecting link between amphibians and fishes.
- Limulus: Not a connecting link; it is a living fossil.

### Final Answer:
**Limulus** is not a connecting link.

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