Hook Worm Skeletal System
Hook Worms are long, skinny worms that are unsegmented. One way Hook Worms can be described as is a "tube within a tube". It has an inside tube that is the digestive tube and the outside tube is the body wall. Like the Caenorhabditis elegans, the Hook Worm has no skeleton. They also have three germ layers that consist of the endoderm (innermost layer), exoderm (outermost layer), and the mesoderm (middle layer).