Roundworms
Jaymee Wolfe
Symmetry
A roundworm has bilateral symmetry.
http://bio.sunyorange.edu/updated2/pl%20new/10%20cnidarians%20and%20worms.htm
Germ Layers
A round worm has three germ layers.
Cephalization
A round worm does have cephalization.
Body Cavity
A round worm does have a body cavity.
http://www2.estrellamountain.edu/faculty/farabee/biobk/biobookdiversity_7.html
Level of Organization
Bilateral symmetry, organ-level of organization, true coelom or pseudocoel
http://www.mhhe.com/biosci/genbio/maderbiology7/student/olc/chap33-outline.mhtml
Digestive System
A roundworm has a definite digestive system that runs the length of their bodies. It has a mouth, pharynx, intestine and anus. Many are parasites and live off other animals and plants. yurtbiostudents.wikispaces.com
Nervous System
A roundworm has two nerve cords that transmit impulses in the roundworm.
Circulartory System
A roundworm has no heart or formal blood vessels.
Respiratory System
A roundworm has no formal respiratory system.
Excretory System
A roundworm has an anus at its rear end and a series of excretory tubes that end in an excretory pore.
Reproduction
A roundworm reproduces sexually. The female has an ovary, holds eggs in an oviduct and then passes them to the uterus, where they are fertilized. The male has sperm cells are made in the testis and stored in the vas deferens. When it is time to reproduce, the sperm cells pass through the spicule. Over 200,000 eggs can be deposited at once in the soil once they are fertilized. http://health.kernan.org/imagepages/1005.htm
Support
A roundworm has no skeleton.
http://www.okc.cc.ok.us/deanderson/Phyla/phyla_html/phyla_nematoda.html