The Helminths Copyright 2004 Pearson Education Inc publishing

The Helminths Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Table 12. 1

• Helminths (parasitic worms) – Eukaryotic – Multicellular animals – Chemoheterotrophic – Kingdom: Animalia • Phylum: Platyhelminthes (flatworms) – Class: Trematodes (flukes) – Class: Cestodes (tapeworms) • Phylum: Nematodes (roundworms) Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings

Trematodes Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 25

Humans as Definitive Host Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 26

Cestodes Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 27

Humans as Intermediate Host Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 28

Nematodes: Eggs Infective for Humans Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 29

Nematodes: Larvae Infective for Humans Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 25. 26

Arthropods as Vectors • Kingdom: Animalia – Phylum: Arthropoda (exoskeleton, jointed legs) • Class: Insecta (6 legs) – Lice, fleas, mosquitoes • Class: Arachnida (8 legs) – Mites and ticks – May transmit diseases (vectors) Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 31, 32

Arthropods as Vectors Copyright © 2004 Pearson Education, Inc. , publishing as Benjamin Cummings Figure 12. 33