invertebrates

​​Echinoderm means spiky skin, they are from the phylum Echinodermata.

​​It feels spiky because of the hard enoskeleton just beneath its thin skin.

​​They also have tiny, stiff hairs called setae that helps them grip surfaces.

​​In the phylum Platyhelminthes, it's name accurately describes it.

• ​They have bilateral symmetry and a flat body shape.

• ​Most live in fresh water or salt water.

• ​Some swim freely, gathering food in the water, others are parasites that can infect humans.

​​Nematodes, or roundworms, are part of the phylum Nematoda.

• ​Some can infect humans, other infect dogs or even plants.

• ​Most live in soils and are too small to see.

• ​They have a hydrostatic skeleton and a hard outer covering called a cuticle for protection.

• ​They shed their cuticle to replace it with a larger one in a process called molting

• ​​Corals, anemones, jellyfish, hydras and Portuguese man-of-war are members of phylum Cnidaria.

• ​The name comes from the special cells these animals use to catch their prey.

• ​Nematocyst cells inject poison into animals that they touch.

• ​They do have true tissues, some swim and move, others attach to rocks like the sponges.