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by 18JRowley2014
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Although each organism shown is classified as a worm, they each contain their own unique defining characteristics both internally and externally.

Defining Charakteristis




A major characterisitic that distinguishes roundowrms from other worms is their complete digestive tract. Another defining characteristic between roundworms and other worms is their round shape which unlike the flatworm and segmented worm.

Parasitic roundworms eat their host's blood, body-fluids, intestinal contents, and mucus. Other roundworm feed on bacteria, fungi, and small plants.

Nematodes, or roundworms, decompose things in their environment. Like other decomposers, nematodes contribute to their environment by converting dead or inorganic matter into new life. Parasitic roundworms however effect their environment negatively by eating eating their host's blood and intestinal organs.

Body Structure


Roundworms are small, cylindrical worms with somewhat pointed heads and tapered tails. Their bodies are bilaterally symmetrical, meaning that if the body were to be divided vertically into left and right halves, each side would contain the same sense organs and limb pairs. Nematodes have three tissue layers, the ectoderm(blue), the mesoderm (red), and the endoderm (yellow). Inbetween the mesoderm and endoderm is the roundworms pseudocoelom, a fluid-filled body cavity in direct contact with the digestive tract. Roundowrms contain a complete digestive tract, similar to the digestion system of rotifers, that has both a mouth and anus at opposite ends of a continuous tube. The pharynx is an important part of this tube that grinds food and transports it directly into the intestines. Roundowrms are not segmented like other kinds of worms.

Roundworms reproduce sexually. The female fertilizes its eggs in the uterus. The male produces sperm cells in the testis that are passed through its spicule. The female can produce over 200,000 eggs at once after they have been fertilized.

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