5.5.4 Distinguish between following animal phyla, using simple external recognition features

PORIFERA = sponges

- simple body
- most primitive of all animals
- live in water
- don't move
- no mouth, just holes where water comes in
- filter water for food and pump it out with even larger holes

CNIDARIA = jellyfish and sea anemones

- stinging cells
- symmetrical
- hollow space in center of body
- one opening to cavity
- often have tentacles around opening

PLATYHELMINTHES = flatworms, ewwww it has a disgusting head

- soft flat body
- definite head region
- bilaterial symmetry
- hollow space in center of body
- one opening to cavity
- live in water or damp environment
- can be free-living, but often parasitic

ANNELIDA = worms and leeches, e.g. earthworm

- bodies of ring-like segments
- mouth and anus
- live in water/moist earth
- free living or parasitic
- no legs
- bristles from body which help them move

MOLLUSCA = snails, squids, clams, slugs

- soft bodies
- unsegmented bodies
- might have a shell

ARTHROPODA = athropod = animals with jointed legs, like ladybird beetle

- exoskeleton (made of chitin)
- segmented body
- appendages to each segment
- at least 3 pairs of jointed legs
- many free-living but some parasitic