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Phylum Nematoda—Roundworms Objectives After completing this exercise, you should be able to 1. Name representative members of the phylum Nematoda. 2. Explain the advantage of having a complete digestive tract. Although only 90,000 species of nematodes (Greek nema, thread; Greek eidos, form) have been identified, it has been estimated that there are close to half a million, living in all habitats and following various lifestyles. Where they occur (and they occur almost everywhere), their numbers are staggering. The top six inches of soil in one acre of a plowed field is estimated to contain billions of nematodes. Nematodes are bilaterally symmetrical. They are generally small (less than 1 cm long). Free-living nematodes eat other nematodes or microorganisms, or they may feed on decaying organic material. Although most species are free-living, some are parasitic on animals (including humans) and

          Phylum Nematoda—Roundworms

Objectives
After completing this exercise, you should be able to
1. Name representative members of the phylum Nematoda.
2. Explain the advantage of having a complete digestive tract.

Although only 90,000 species of nematodes (Greek nema, thread; Greek eidos, form) have been identified, it has been estimated that there are close to half a million, living in all habitats and following various lifestyles. Where they occur (and they occur almost everywhere), their numbers are staggering. The top six inches of soil in one acre of a plowed field is estimated to contain billions of nematodes.
Nematodes are bilaterally symmetrical. They are generally small (less than 1 cm long). Free-living nematodes eat other nematodes or microorganisms, or they may feed on decaying organic material. Although most species are free-living, some are parasitic on animals (including humans) and

Phylum Nematoda—Roundworms

Objectives
After completing this exercise, you should be able to
1. Name representative members of the phylum Nematoda.
2. Explain the advantage of having a complete digestive tract.

Although only 90,000 species of nematodes (Greek nema, thread; Greek eidos, form) have been identified, it has been estimated that there are close to half a million, living in all habitats and following various lifestyles. Where they occur (and they occur almost everywhere), their numbers are staggering. The top six inches of soil in one acre of a plowed field is estimated to contain billions of nematodes.
Nematodes are bilaterally symmetrical. They are generally small (less than 1 cm long). Free-living nematodes eat other nematodes or microorganisms, or they may feed on decaying organic material. Although most species are free-living, some are parasitic on animals (including humans) and

Added by John B.

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