How do you distinguish a 'hirudinéaun' from the rest of the annelids, based on the morphological features pertaining to metamerism ? How does the coelom of a leech differ from the coelom of an earthworm with reference to its contents ?

Explanation

In hirudineaun like Leach, body is with a definite number of segments. The segments are externally sub divided into annute, internal segmentation is absent. In Leech coelom is filled with a characteristic tissue called botryoidal tissue. In earthwarm coelom is filled with coelomic flui.