- How does it move? It is fixed to something by a stalk, a foot or a base, and contracts when disturbed
What is attached?
Look at the far end, then at the front: a single cell, or a body with organs inside?
A small bell on a thin thread that coils like a spring and snaps back→ Bell animalcules- A large trumpet with a ring of cilia around the wide end; may let go and swim→ Stentor
A many-celled body with whirling crowns and a pumping jaw inside, standing on a foot→ Rotifers- A tube with a ring of long tentacles, a few millimetres long, contracts to a blob→ Hydra
- A colony of tubes, each animal with a crown of feathery tentacles→ Moss animals