Step 1: Understand metameric segmentation.
Metameric segmentation means the body is divided into many similar segments, and organs repeat in each segment. This is a key feature of the phylum Annelida.
Step 2: Look at Pila.
Pila is a snail, a mollusc. Its body is soft and not divided into repeating segments, so it does not show metamerism.
Step 3: Look at Periplaneta.
Periplaneta is the cockroach, an arthropod. Its body parts are grouped into head, thorax, and abdomen, called tagmatization. This is not true metameric segmentation.
Step 4: Look at Pheretima.
Pheretima is the earthworm, an annelid. Its body is made of many ring-like segments with organs repeating in each one. This is true metameric segmentation.
Step 5: Look at Asterias.
Asterias is the starfish, an echinoderm. It shows radial symmetry, not segmentation.
Step 6: Pick the right animal.
Only the earthworm Pheretima shows true metameric segmentation.
\[ \boxed{\text{Pheretima}} \]