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Lecture 46

BIOL 1010 Lecture 46: Lecture 46

4 Pages

Biological Sciences
Course Code
BIOL 1010
Emily A.Mc Kinnon

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o78P Bio 1010 Behind the Scolex is a long ribbon of repeated units filled with both male & female reproductive structures. Units of the posterior end which are full of ripe eggs break off & pass out the host’s body in feces. The term worm is applied to any slender, elongated vertebrate. Flatworms are just 1 of 3 major animal phyla known as worms. Flatworms & Cnidarians differ in symmetry: o Flatworms are bilateral. o Cnidarians are radial. o But animals of both phyla have a Gastrovascular cavity. Section 20.8 – Nematodes have a Pseudocoelom and a complete digestive tract. Nematodes (roundworms) make up the phylum Nematoda. o Bilateral symmetry & an embryo with 3 tissue layers. o Nematodes are cylindrical with a blunt head & tapered tail. o Range in size from less than 1mm – 1m. Flatworms, roundworms have fluid-filled body cavity (Pseudocoelom, not completely lined with mesoderm) & a digestive tract with 2 openings. Several layers of tough, nonliving material called cuticle cover & prevent the body from drying out. o FIGURE 20.8A -------------------------------------------------------------- --- In parasite species, the cuticle protects the nematode from the host’s digestive system. When the worm grows, it sheds the cuticle
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