Roundworm
by Ben Deyo
Level of Organization
Phylum nematoda have a system level of organization. They are roundworms with bodies that are not divided into separate segments.
Germ Layers
Roundworms are triploblastic, which means their embryos have all three germ layers.
Symmetry
The roundworm has bilateral symmetry, which means its body is separated into two parts
Cephalization
Does have cephalization. Most sensory organs and nerve cells located at anterior end. This is known as cephalization
Body Cavity
Pseudocoelom
Segmentation
There is no segmentation in roundworms.
Digestive System
Complete Digestive system as seen below
Circulatory System
none present.
Respiratory System
none present.
Excretory System
Lateral Lines
Nervous System
Dorsal and Ventral Nerve Cords
Reproduction
sexual reproduction. Which means it needs another organism to reproduce.
Support
Hydrostatic Skeleton