A student was given a specimen to identify on the basis of the characteristics given below.

1. They are metamerically segmented.
2. Presence of closed circulatory system.
3. They have circular and longitudinal muscles for locomotion.

Identify the specimen.

The given specimen shows the characteristics of earthworm (Pheretima). An earthworm is a tube-shaped, segmented worm commonly found living in soil that feeds on live and dead organic matter. Earthworm is the common name for the largest members of oligochaeta in the phylum annelida.