Define metameric segmentation. Where does it occur?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Metameric Segmentation**:
Metameric segmentation refers to the division of the body of an organism into a series of repetitive segments or units, known as metameres. Each segment is externally marked by annular rings (also called annuli) and is internally separated by structures known as septa.

2. **Characteristics of Metameric Segmentation**:
- Each segment (metamere) is structurally and functionally similar but can also have specialized functions.
- The external appearance of the organism shows clear segmentation due to the presence of annular rings.
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