Weebly · Web viewPhylum Nematoda: Roundworms Domain: Kingdom: Learning Objectives: *Refer to...
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Name: Date:
Phylum Nematoda: Roundworms
Domain: Kingdom:
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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-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.
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Nematoda Species
*Take your own notes on the Nemtoda species below using the information provided below, text page 373 and web resources.
1. Onchocerca volvulus
a) Is this nematode Parasitic or Free Living? ____________________________ _____________________
b) Does this nematode cause a disease (if so, what is it)? _______________________________________
c) What is the reservoir for Onchocerca volvulus? _____________________________________________
d) How is it transferred? What is the vector species? _________________________________________
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e) What symptoms do people infected with this nematode exhibit? Are these symptoms directly caused by the nematode?
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f) Is there any treatment available (if so, what is it)?
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g) What can be done to interrupt the lifecycle of this nematode and prevent it from parasitizing humans?
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2. Caenorhabditis elegans
a) Is this nematode Parasitic or Free Living? ____________________________ _____________________
b) Does this nematode cause a disease (if so, what is it)? _______________________________________
c) In what habitats are Caenorhabditis elegans found? _________________________________________
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d) What role does this nematode play in its habitat? __________________________________________
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e) In the development of Caenorhabditis elegans, it must go through a number of molts to shed its cuticle. In the space below, define what “molting” is, why the nematode must molt and how many molts are undertaken to reach maturity.
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f) What is a “Dauer”?
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g) Why is Caenorhabditis elegans an important research organism in Biology?
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