Which of the following evidences help us to find systematic position of animals like Sacculina and Herdmania?

Options

A. Morphological and anatomical evidences
B. Palaentological evidences
C. Embrylogical evidences
D. Geographical evidences

Answer

To determine the systematic position of animals like Sacculina and Herdmania, we can follow these steps:

### Step 1: Identify the Organisms
- **Sacculina**: This organism belongs to the phylum **Arthropoda**. It is a type of barnacle that is a parasitic form.
- **Herdmania**: This organism belongs to the phylum **Chordata**, specifically the subphylum **Tunicata**. It is a marine invertebrate.

### Step 2: Analyze the Evidence Types
We need to evaluate different types of evidence that can help in determining the systematic position of these organisms:

1. **Morphological and Anatomical Evidence**: This refers to the physical structure and form of the organisms. However, many organisms can share similar morphological traits, making this evidence unreliable for establishing systematic relationships.

2. **Paleontological Evidence**: This involves the study of fossils. While fossils provide information about the age and habitat of organisms, they do not directly indicate systematic relationships.

3. **Embryological Evidence**: This type of evidence involves studying the development of embryos. It can reveal evolutionary relationships based on developmental similarities and differences, making it a strong basis for determining systematic positions.

4. **Geographical Evidence**: This refers to the habitats where organisms are found. While organisms in similar habitats may share some traits, this does not necessarily indicate a close evolutionary relationship.

### Step 3: Conclusion
Based on the analysis of the types of evidence, the most reliable evidence for determining the systematic position of Sacculina and Herdmania is **embryological evidence**. This evidence provides insights into the evolutionary relationships based on developmental patterns.

### Final Answer
The correct evidence that helps us find the systematic position of animals like Sacculina and Herdmania is **embryological evidence**.

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