The protozoan with helicopodia as locomotory structures is

Options

A. Actinophrys
B. Entamoeba
C. Elphidium
D. Euglypha.

Answer

To solve the question regarding the protozoan with helicopodia as locomotory structures, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Term "Helicopodia":**
- Helicopodia refers to a specific type of locomotory structure found in certain protozoans. It is synonymous with exopodia, which are extensions of the cell used for movement and capturing prey.

2. **Identifying the Protozoan Types:**
- The question provides four options: Actinopyrates, Entamoeba, Lepadomus, and Uglipa. We need to determine which of these has helicopodia.

3. **Analyzing the Options:**
- **Actinopyrates:** This group is known for having helicopodia (or exopodia) that are used for locomotion and capturing prey. The structure consists of a central rod covered by a thin layer of cytoplasm.
- **Entamoeba:** This genus is known for its pseudopodia, not helicopodia.
- **Lepadomus:** This is not a recognized group in the context of locomotory structures.
- **Uglipa:** This option does not correspond to any known protozoan with helicopodia.

4. **Conclusion:**
- Based on the analysis, the correct answer is **Actinopyrates**, as they possess helicopodia for movement and other functions.

### Final Answer:
The protozoan with helicopodia as locomotory structures is **Actinopyrates**.