Earthworms, Tapeworms and Roundworms are long and cylindrical shaped worms. The basic difference between them is that Earthworms are segmented invertebrates belonging to the phylum Annelida, Tapeworms are...

Both, Leeches and Slugs are elongated-slimy creatures, but vary in their habitats. Leeches are relatives of earthworms, and mostly feed upon blood of other creatures, whereas Slugs belongs to Mollusks, hence...

Earthworms and Leeches are hermaphrodites, but differ in their subclasses; Earthworms fall under sub class Oligochaeta, whereas Leeches fall under Hirudinae.