They migrate to the lungs, then to the liver and, later, other organs. Symptoms include anemia, malnutrition, fever,
abdominal pain, fluid buildup, and sometimes death.
Figure 5.20 Phylum Platyhelminthes is divided into four classes. (a) Class Turbellaria includes the Bedford’s
flatworm (Pseudobiceros bedfordi), which is about 8–10 cm long. (b) The parasitic class Monogenea includes
Dactylogyrusspp. Worms in this genus are commonly called gill flukes. The specimen pictured here is about 0.2 mm
long and has two anchors, indicated by arrows, that it uses to latch onto the gills of host fish. (c) The Trematoda class
includes the common liver flukeFasciola hepaticaand the giant liver flukeFascioloides magna(right). TheF. magna
specimen shown here is about 7 cm long. (d) Class Cestoda includes tapeworms such asTaenia saginata, which
infects both cattle and humans and can reach lengths of 4–10 meters; the specimen shown here is about 4 meters
long.
202 Chapter 5 | The Eukaryotes of Microbiology
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