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Name: Date:
Phylum Nematoda: Roundworms
Domain: Kingdom: Phylum:
Learning Objectives: *Refer to Kingdom Animalia Unit Plan
Text page: 373 *This is required reading.
-Roundworms belong to the Phylum ______________________________, which means ____________________ in Greek. This is appropriate as many of them look like fine sewing thread.
-Roundworms were the first animals to have a pseudocoelom and tube-within-a-tube digestive tract!
Biology 11: Phylum Nematoda Page 1
Nematoda Habitat
-Nematodes may be the most common of all multi-cellular animals:
-A single rotting apple may contain ____________________ roundworms!
-An acre of topsoil can contains ____________________ roundworms!
-There are ____________________ species of named nematodes and it is believed there could be as many as ____________________ species in total.
-Nematodes are found free living in soil and aquatic habitats (and act as important decomposers there) and as predators inside many plants and animals (humans included).
Nematoda Innovations and Common Characteristics
1. Their body cavity is not a __________ __________ __________ __________ like Flatworms, but a “fake” coelom. This is called a ______________________________.
-Draw a diagram of a pseudocoelom and label: endoderm, pseudocoelom, mesoderm, ectoderm and cuticle.
-The pseudocoelom is a fluid filled body cavity. What are the advantages of this?
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Biology 11: Phylum Nematoda Page 2
-What is the cuticle? Why is it important?
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2. They are the simplest animals to have a separate __________ and __________. This allows them to have a __________________________________________ body plan.
-What is a complete digestive tract and what are the advantages of this organ system?
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3. Examining the Roundworm diagram found on the previous page, do Roundworms have specialized respiration, circulation and excretion systems?
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4. In terms of reproduction, Roundworms are different than Flatworms because they have separate sexes with complex reproductive systems.
Biology 11: Phylum Nematoda Page 3
Nematoda Species:
1. Onchocerca volvulus (River Blindness)
2. Caenorhabditis elegans
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Biology 11: Phylum Nematoda Page 4
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Biology 11: Phylum Nematoda Page 5