Sponges , Cnidarians,Arthropoda, Echnoderms


Sponge - one type of animal that filters the water it lives in to get food.

Example - Venus-Flower Basket,


- reproduce asexually

- can’t move once they attach as adults

- gets food from environment around it.

- between inner and outer layer there is a jelly-like layer

- grow at almost any depth

- grow on hard surfaces

- shaped like fingers, tree branches or round

- filters water to get its food

- 5000 known species

-no real digestive system

Adaptation - body is a network of tiny pores and canals that allow water to filter through to obtain food because they don’t move.


cnidarians -has the ability to sting its prey, carnivorous animals, or meat-eating, poison in tentacles.


tentacles that sting its predators and bring food to mouth (digestive system)

waste leaves through mouth

no organs, cells organized instead of tissues, outer layer is protection and inner layer is used for digestion

live in water

radial symmetry

Polyp or Medusa Form

reproduce sexually and asexually

Adaptation - coral produces a skeleton to protect its soft body; some sting its predators with tentacles



Echinoderms - are invertebrates that have internal skeletons and spines sticking out from their bodies

examples: starfish, sand dollars, sea urchins, sea cucumbers


Interval skeletons and spines

live only in the ocean

get oxygen from seawater

most adults appear to have radial symmetry

spiny skin


no head or brain

tube feet

Adaptation - Mouth is at the center of underside with powerful jaws and hidden among their spines and poison glands. They also have tube feet for moving, feeding and sensing respiration