Kristyn Atz


A roundworm has bilateral symmetry

Germ Layers

A roundworm has three germ layers.


A roundworm has cephalization

Body Cavity

Roundworms have a body cavity

Level of Organization

Bilateral symmetry, organ-level of organization, true coelom or pseudocoel

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.

Nervous System

A roundworm has two nerve cords that transmit impulses in its body

Circulartory System

Roundworms have no heart or formal blood vessels

Respiratory System

They do not have a formal respiratory system

Excretory System

Roundworms have an anus at its rear end and a series of excretoy tubes that end in an excretory pore


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.


Roundworms dont have a skeleton