Invertebrates

Segmented worms, Round worms, Flat worms Logan H.

Segmented worms

Segmented Worms - An animal, such as the earthworm, whose body is made up of connected sections, or segments.


Example: earthworms


Characteristics

- Body is made up of segments

- circulatory system

- Five enlarged tubes act like hearts,

- Has a brain or nerve center



Adaptation - two sets of muscles enable the earthworm to move through the soil.


Photo from: http://kids.britannica.com/elementary/art-67299/Earthworms-belong-to-a-group-of-worms-known-as-segmented


Round worms

Roundworm - an animal, with a round tube like body, that has a digestive system with two openings

Example: Ascaris


Characteristics

- Have a digestive system with two openings

- Has a tube like body

- Round body

- Muscles run length wise


Adaptation - whiplike muscles to get away from predators.


Picture from: http://www.thelifetree.com/roundworms.htm



Flat worms

Flatworm - An animal, such as a planarian, that has a flattened body, a digestive system with only one opening, and a simple nervous system.

Example: planarians



Characteristics

- flattened body

- digestive system

- nervous system

- usually small

- stay out of light

- live in freshwater/saltwater



Adaptation - during the daylight they are usually found under rocks or freshwater environments.


Picture from: http://www.diverosa.com/categories/Flatworms.htm