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