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Three different phylum of worms are platyhelminth, annelid, and nematode. The table below shows examples of each worm.

These worms have good and bad characteristics. A bad characteristic is that some worms are parasites that live in a host and feeds off of them, thus harming the host. A good characteristic of the earthworm, foe example, is that they enrich the soil making the food we eat grow faster. The ability for worms to grow back lost body parts is called regeneration. (See Parasites of Man for more information about the organisms.)

Earthworm

The earthworm’s scientific classification is Lumbricus Terrestris. Earthworms can grow up to the length of 11 feet. This worm has a primitive kidney called metanephrida. The difference between the grasshopper and earthworm is that the grasshopper is part of the phylum anthropoids, while the earthworm is part of the phylum annelid. An internal difference between the grasshopper and earthworm is that the grasshopper has an open circulatory system having the blood not contained in blood vessels, but throughout the whole body. The earthworm has an open circulatory system meaning the blood flows through blood vessels.

Bibliography

1. "Earthworm," The World Book Encyclopedia. V. 6, 1993.
2. "Nasco's Dissection Guide For the Earthworm," Fort Atkinson, Wisconsin, Nasco, 1981.
3. Watkins, Patricia A. HOLT Life Science. Austin: Holt, Rinehart, and Winston, 1994.

Worm © 1998 Jacob Eapen.