Chordata Urochordata

1. Chordata
Urochordata
Tunicates
Created by: Tanna Holliday & Makhaya
Richards
7
th
period
5/19/09
Sea squirts
http://tolweb.org/Urochordata/1
4821
http://tolweb.org/Urochordata/14
821

2. Classification
•Phylum Chordata
•Class Apendicularia (Sea Squirts)
•Class Ascidiacea
•Class Thaliacea (Scalps)
http://images.google.com/images?
hl=en&q=sea+squirts&gbv=2&aq=f&o
q=

3. The Body (Tunicates)
•Bilateral Symmetrical
•Notochord- Body structure gained while
maturing, lost when adult, but replaced by
vertebrates (backbone) in later life.
•Body Structure- a semi-flexible rod
running through the length of their body
•They lack bone
•Muscles work against the body for
locomotion

4. Reproductive system
•Are hermaphroditic (both male and female
at the same time)
•Sperm are released into the sea while the
eggs are kept inside the body.
•Eggs are fertilized by new sperm coming
in with incoming water
•Eggs kept inside until they hatch

5. Digestive system
•They eat by taking water in through
inhalant siphon
•Water goes through pharynx and that is
where particles of water are filtered
•Current is kept by beating cilia
•They are able to push water out of their
Ariel cavity by contracting muscles if
frightened

6. Circulatory System
•Blood is pumped by sinuses.
•They are not true blood vessels but do the
same function
•If the heart stops pumping and restarts the
blood will flow in the opposite direction it
was before the heart stopped.

7. Respiratory System
•Oxygen diffusion in the bronchial sack
(A.K.A lungs)
•Pump water through the bronchial sack
and get the oxygen from the water
http://biodidac.bio.uottawa.ca/Thumbnails/sho
wimage.cfm?
File_name=UROC005B&File_type=GIF

8. Environment
•Tunicates live on rocky shores
•Also found in great depths of oceans
http://media.npr.org/programs/day/fe
atures/2007/feb/tunicate200.jpg

9. Interaction with Humans
•Since sea squirts live in the depths of the
ocean humans do not have much
interaction with them
•We usually would not eat them

10. Fun Facts
•Tunicates are evolutionary links between
invertebrates and vertebrates
http://www.discoverjamaica.com/shop/mo
na/images/gallery/clavelina_picta3.jpg

11. Pics!!!

12. Bibliography
•http://www.tolweb.org/tree/
•http://www.earthlife.net/
http://photography.nationalgeographic.com/staticfiles/NGS/Shared/Stati
cFiles/Photography/Images/Content/sea-squirts-and-clingfish-377523-
sw.jpg/