GENERAL HISTOLOGY

Detailed explanation-1: -Earthworms and leeches both belong to a group of invertebrates called annelids. These are soft worms whose bodies are split into parts, called segments. Each segment has its own set of organs.

Detailed explanation-2: -leech, (subclass Hirudinea), any of about 650 species of segmented worms (phylum Annelida) characterized by a small sucker, which contains the mouth, at the anterior end of the body and a large sucker located at the posterior end. All leeches have 34 body segments.

Detailed explanation-3: -Earthworms belong to phylum annelida. This phylum is part of the animal kingdom and includes marine, freshwater and terrestrial worms in addition to leeches.

Detailed explanation-4: -Leeches are segmented parasitic or predatory worms that comprise the subclass Hirudinea within the phylum Annelida. They are closely related to the oligochaetes, which include the earthworm, and like them have soft, muscular segmented bodies that can lengthen and contract.

Detailed explanation-5: -earthworm, also called angleworm, any one of more than 1, 800 species of terrestrial worms of the class Oligochaeta (phylum Annelida)-in particular, members of the genus Lumbricus.