A limbless amphibian is

Options

A. hyla
B. ichthyophis
C. Alytes
D. bufo

Answer

To determine which of the following is a limbless amphibian, we can analyze the options provided:

1. **Hyla**: This is commonly known as a frog. Frogs are amphibians that typically have limbs. Therefore, Hyla cannot be the correct answer as it is not limbless.

2. **Ecthyopis**: This is a genus of amphibians known to be limbless. It is an exception among amphibians, as most amphibians possess limbs. Thus, Ecthyopis is a limbless amphibian.

3. **Halitis**: This refers to a type of frog, which also has limbs. Therefore, Halitis cannot be the correct answer.

4. **Bufo**: This is a genus of toads, which also possess limbs. Hence, Bufo is not a limbless amphibian.

Based on this analysis, the correct answer is **Ecthyopis**, as it is the only limbless amphibian among the options given.

### Summary of Steps:
1. Identify each option and its characteristics.
2. Determine if the organism is limbless or has limbs.
3. Conclude that Ecthyopis is the limbless amphibian.