phylum platyhelminthes the flatworms l.
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Phylum : Platyhelminthes The Flatworms. Acoelomates. Classes of Platyhelminthes. Class Turbellaria (e.g., Planaria ) The Flukes Class Trematoda (e.g., Fascioloaris, Clonorchis ) Class Monogenea Class Cestoda (e.g., Taenia ). General Characteristics. Free-living or parasitic

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Presentation Transcript
classes of platyhelminthes
Classes of Platyhelminthes
  • Class Turbellaria (e.g., Planaria)
  • The Flukes
    • Class Trematoda (e.g., Fascioloaris, Clonorchis)
    • Class Monogenea
  • Class Cestoda (e.g., Taenia)
general characteristics
General Characteristics
  • Free-living or parasitic
  • Bilaterally symmetrical, and dorsoventrally flattened
  • First animals with 3 germ layers - triploblastic
    • Ectodermis
    • Mesodermis
    • Endodermis
  • Epidermis has cilia or cuticle
  • Coelom lacking (acoelomate)
general characteristics cont
General Characteristics cont.
  • Digestive system incomplete
  • Excretory system – protonephridia
  • Nervous system – ladder-like
  • Respiratory, circulatory, and skeletal system lacking
  • Most monecious
  • Some have fragmentation and regeneration (Asexual)
class turbellaria freeliving flatworms
Class TurbellariaFreeliving Flatworms
  • Free-living
  • Ciliated epidermis
  • Mouth ventral
  • Digestive system incomplete
dugesia w m
Dugesia w.m.

Eyespots

Auricle

figure 14 02
Figure 14.02

Freshwater Flatworm

figure 14 co
Figure 14.co

Marine Flatworm

trematoda and monogenea the flukes
Trematoda and Monogenea The Flukes
  • Endoparasites
  • Cuticle covering body
  • Oral sucker surrounds mouth
  • Ventral sucker used for attachment
  • Complex life cycles
slide19

One Intermediate host

Shistosoma – Blood Fuke

cestoda the tapeworms
CestodaThe Tapeworms
  • Endoparasites
  • Body consists of proglottids and scolex
  • Proglottids snapshots of development
  • Scolex has structures for attachment (Hooks, suckers and rostellum)
  • No digestive system
figure 14 20
Figure 14.20

Mature

Proglottids

slide27

Hydatid Cysts of dog tapeworm in human brain

A case of a parasite in the wrong host