Invertebrates Sponges,cnidarians

Segmented worms,roundworms,Echinoderms-David

Sponges

Sponges

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

Example - Venus-Flower Basket,


Characteristics

- 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

Cnidarians

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


Characteristics

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.


Characteristics

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

Roundworms

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

Example: hookworm


Characteristics

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

Echinoderms

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

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


Characteristics

Interval skeletons and spines

live only in the ocean

get oxygen from seawater

most adults appear to have radial symmetry

spiny skin

endoskeleton

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