The name worm is used for many unrelated animals with a slender elongated body shape. They can be distinguished from each other by their ways of locomotion.
Oligochaetes wriggle and use bristles
Flatworms slowly glide with the aid of tiny cilia
Nematodes (roundworms) move frantic in S-shaped curves.
Flatworms slowly glide with the aid of tiny cilia
Nematodes (roundworms) move frantic in S-shaped curves.
Oligochaete
Nematode
Oligochaete
Flatworm
Flatworm