Ascaris lumbricoides
Ascaris lumbricoides evolved with humans, and it lives in the intestines of millions of people. Large and active, it has inspired many tales and considerable folklore.
Ascaris lumbricoides is otherwise known as the large intestinal roundworm of humans. It looks a lot like a large earthworm, but the two are not related. The earthworm is an annelid; it lives in the soil, feeding on organic debris. Ascaris lumbricoides is a parasitic nematode, or roundworm; adults are found only in the intestines of humans, feeding on intestinal contents. If you were to compare the two very carefully, you would note that the earthworm has little tufts of bristles and its body is marked with many rings, as though it was built a slender ring at a time. The body of ascaris is smooth and hairless, and the worm has three lips at the mouth end, arranged like the leaves of a three leaf clover.Ascaris lumbricoides worms have a reputation for wandering, and often do so if the body they are in - the host - is ill or taking certain medications. Adult roundworms sometimes spontaneously exit the host through the anus, mouth, or nose. They are found in the bathtub, toilet bowl, in diapers, or even on the pillow upon waking. Females can be well over a foot long; males are smaller. For many people, the appearance of a large worm is a traumatic experience, and no doubt the source of many tales about worms.
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