Pinworm (Enterobius vermicularis)

Pinworms, as their common name implies, are tiny pin-shaped nematodes known as Enterobius vermicularis to the medical and zoology communities. Also called seatworms or threadworms, the small, whitish roundworms are responsible for contagious intestinal parasite infestations that commonly inflict preschool children and other crowded settings such as nurseries, schools, and hospitals.