Invertebrates Sponges,cnidarians

Segmented worms,roundworms,Echinoderms-David



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

Segmented worms

Segmented Worms

Segmented Worms

These are worms whose bodies are made up of connected sections, or segments. Example: earthworm.


body made up of connected segments

circulatory system - 5 enlarged tubes that act like hearts

nervous system - brain and main nerve

breath through skin

two sets of muscles that allow it to move

takes in food through mouth

reproduce sexually

Adaptation - breath through skin in the soil

Round worms


Roundworm - a worm with a round, tube like body. Most are too small to be seen.

Example: hookworm


digestive system with 2 openings

take in food and eliminate waste

muscles that run length of body

reproduce sexually

nervous system with brain and simple sense organs

Adaptation - parasitic roundworms live in other animal’s body to get food and protection



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