Annelids, Nematodes and Molluscs

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Annelids, Nematodes and Molluscs are all living things.


Annelids are worms with bodies made up of many segments or rings. An example of an annelid is the earthworm. Some annelids have a head region (sometimes antenae as well), while others are harder to tell which end is the head. Annelids use chaetae for locomotion - these are tiny hairs which grip the surface.


Nematodes are worms. However, unlike annelids, their bodies are not segmented and they have no obvious head. They are long, white and thin and have no legs. They also never have chaetae - another difference from annelids. Many live in the soil, while others live in digestive systems of animals, like parasites.


Molluscs include slugs, snails and octopuses (among others). They all have soft bodies, often enclosed inside a shell made of calcium carbonate. In other species, the shell is inside the body. Their bodies are not segmented. Most also have a foot which secretes mucus. This helps with locomotion.

Different types of feedingEdit

  • Some have a tongue, for example snails - this is used to scrape leaves or other plant matter.
  • Some are filter feaders, like mussels. This allows them to trap little bits of food which is in water.
  • Others, for example octopuses and squid are more mobile, using their tentacles to catch other animals.

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