Taxonomic Retrospect of Phylum Platyhelminthes
Taxonomic Retrospect of Phylum Platyhelminthes
Taxonomic Retrospect of Phylum Platyhelminthes
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(i) Turbellaria,
(ii) Trematoda.
Definition of Phylum
Platyhelminthes:
Triploblastic, acoelomate, un-segmented and bilaterally
symmetrical metazoans, without anus, circulatory
system, but with a mouth, protonephridial system,
parenchyma tissues within the space between the body
wall and the gut, and spiral cleavage development.
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Phylum Platyhelminthes
Class Turbellaria
Class Trematoda
Subclass Digenea
Class Monogenea
Subclass Cestodaria
Subclass Eucestoda
Features:
3. Un-segmented body.
A. Archoophoran turbellaria:
3. Eggs entolecithal.
Order 1. Nemertodermatida:
Example. Nemertoderma.
Order 2. Acoela:
Order 3. Catenulida:
2. Simple pharynx.
5. Unpaired gonads.
Order 4. Macrostomida:
3. Paired protonephridia.
Order 5. Polycladida:
2. Eyes numerous.
B. Neoophoran turbellaria:
3. Eggs ectolecithal.
Order 1. Lecithoepitheliata:
3. Simple intestine.
Order 2. Prolecithophora:
3. Simple intestine.
4. Penis unarmed.
Example. Plagiostomum.
Order 3. Proseriata:
1. Mostly marine.
3. Gut simple.
4. Statocysts present.
Order 4. Rhabdocoela:
2. Bulbous pharynx.
4. Protonephridia either 1 or 2.
5. Colourless.
Order 5. Tricladida:
4. Plicate pharynx.
8. Mostly free-living.
Examples:
Features:
7. Mostly hermaphrodites.
8. No asexual reproduction.
Features:
3. Hooks absent.
9. Chiefly endoparasite.
Features:
Examples:
Features:
Experiment
8. There is no intermediate to Observe
host and the one egg gives
rise to only one adultAdaptive Features
worm, hence in Animals
the name
(With Pictures)
“Monogenea”.
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Features:
8. Hermaphrodite.
Subclass 1. Cestodaria:
Features: