In which one of the following the genus name, its two characters and its phylum are incorrectly matched ?

Options

A. `{:("Genus name ","Two characters",),("a) Pila ","Body Segmented"/"Mouth with radula","Mollusca"):}`
B. `{:("Genus name ","Two characters",),("b) Asterias ","Spiny Skinned"/"Water vascular system","Echinoermata"):}`
C. `{:("Genus name ","Two characters",),("c) Sycon ","Pore bearing"/"Canal system","Porifera"):}`
D. `{:("Genus name ","Two characters",),("d) Periplaneta","Jointed appendages"/"Chitinous exoskeleton","Arthropoda"):}`

Answer

To solve the question of which genus name, its two characters, and its phylum are incorrectly matched, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze Option A: Pyla**
- **Genus Name:** Pyla (commonly known as the apple snail)
- **Phylum:** Mollusca
- **Characteristics:**
- Body segmented: **Incorrect** (Pyla has an unsegmented body)
- Mouth with radula: **Correct** (Mollusca have a radula, which is a rasping organ used for feeding)
- **Conclusion:** This option is incorrectly matched because the first character is wrong.

2. **Analyze Option B: Asterias**
- **Genus Name:** Asterias (commonly known as starfish)
- **Phylum:** Echinodermata
- **Characteristics:**
- Spiny skin: **Correct** (Echinodermata have spiny skin)
- Water vascular system: **Correct** (A distinctive feature of Echinodermata)
- **Conclusion:** This option is correctly matched.

3. **Analyze Option C: Sycon**
- **Genus Name:** Sycon (a type of sponge)
- **Phylum:** Porifera
- **Characteristics:**
- Pore-bearing: **Correct** (Sponges have a porous body)
- Canal system: **Correct** (Sponges have a water canal system)
- **Conclusion:** This option is correctly matched.

4. **Analyze Option D: Periplaneta**
- **Genus Name:** Periplaneta (commonly known as cockroach)
- **Phylum:** Arthropoda
- **Characteristics:**
- Jointed appendages: **Correct** (Arthropods have jointed limbs)
- Chitinous exoskeleton: **Correct** (The exoskeleton is made of chitin)
- **Conclusion:** This option is correctly matched.

### Final Answer:
The incorrectly matched option is **A: Pyla** because the character "body segmented" is wrong.

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