Download Phylum : Platyhelminthes

Phylum : Platyhelminthes
General Characteristics
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Free-living or parasitic
Bilaterally symetrical, and dorso-ventrally
flattened
Epidermis has cilia or cuticle
Coelom lacking (acoelomate)
Digestive system incomplete
Excretory system – protonephridia
Nervous system – ladder-like
General Characteristics
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Respiratory, circulatory, and skeletal
system lacking
Most monecious
Some have fragmentation and
regeneration (Asexual)
Class Turbellaria
Turbellaria
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Free-living
Ciliated epidermis
Mouth ventral
Digestive system simple
Dugesia w.m.
Dugesia c.s.
Class Trematoda
Trematoda
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Endoparasites
Cuticle covering body
Oral sucker surrounds mouth
Ventral sucker used for attachment
Complex life cycles
Clonorchis
Sporocyst – Larval stage
Class Cestoda
Cestoda
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Endoparasites
Body consists of proglottids and scolex
Proglottids snapshots of development
Scolex has structures for attachment
(Hooks, suckers and rostellum)
No digestive system
Taenia
Taenia w.m.
Taenia
Proglottids