PSEUDOCOELOMATES
(True to only themselves)
Reading: We will study only two of the many pseudocoelomate phyla -- Phylum Rotifera and Phylum Nematoda. Read Phylum Rotifera on pages 434-435. Read Phylum Nematoda: Roundworms on pages 437-442 and stop when you reach Phylum Nematomorpha.
Before Class: Complete the reading
and answer the questions below. If you'd like to witness a live birth, rotifer
style, click here
http://micscape.simplenet.com/avis/walker1.htm
You should understand the life cycle of the rotifer illustrated below and the difference beween amictic and mictic eggs.
University of Southern Mississippi
In Class: Be able to state the major characteristics of the Phyla Rotifera and Nematoda. Explain reproduction in each phyla.
Chapter Review Quiz: Do Chapter 20 Quiz.
http://www.mhhe.com/biosci/pae/zoology/
Key Words: pseudocoel, corona, foot, mastax, pedal glands, amictic eggs, mictic eggs, muscle layers, hydrostatic skeleton, roundworm (Ascaris), hookworm (Necator), Trichina worm (Trichinella), haplodiploidy
Questions:
1. What is the difference between mictic and amictic eggs of rotifers? What is the advantage of each? Why would an organism have both rather than one or the other?
2. Outline the life cycles of Ascaris, Necator and Trichinella. What are the major differences?
3. How do cuticle, muscle layers and pseudocoelomic fluid interact in the locomotion of naematodes?
