A metatherian without a marsupium is

Options

A. Didelphis
B. Myrmecobius
C. Bandicoot
D. Koala .

Answer

To solve the question "A metatherian without a marsupium is", we can follow these steps:

### Step 1: Understand the Terminology
- **Metatherians** are a group of mammals that includes marsupials. They belong to the infraclass **Marsupialia** within the class **Mammalia**.
- **Marsupium** is the pouch that many marsupials have to carry and protect their young.

### Step 2: Analyze the Options
- The options provided are:
1. Didelphys
2. Myrmecobius
3. Bandicoot
4. Coelacanth

### Step 3: Identify the Characteristics of Each Option
- **Didelphys**: This is a genus that includes opossums, which have a marsupium.
- **Myrmecobius**: This is the numbat, which is a metatherian that does not have a true marsupium.
- **Bandicoot**: Bandicoots are marsupials and possess a marsupium.
- **Coelacanth**: This is not a metatherian; it is a type of fish and does not belong to the class Mammalia.

### Step 4: Determine the Correct Answer
- Since the question asks for a metatherian without a marsupium, the only correct answer is **Myrmecobius** (the numbat), as it is a metatherian that lacks a proper pouch.

### Conclusion
The correct answer to the question "A metatherian without a marsupium is" is **Myrmecobius**.

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