Roundworms - Phylum Nematoda
Characteristics:
1. Separate sexes
2. Larvae = miniature adults
Eggs infective for humans-It is dioecious with sexual dimorphism; that is, the male, and female worms look distinctly different, the male being smaller with a curled tail. pinworm or whipworm Larvae infective for human-the parasitic worm is called heartworm, because the adult stage is often in the animal host's heart, where it can kill its host through congestive heart failure.