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Sunday 10 March 2013

Classification of Phylum Platyhelminthes


Phylum :-  Platyhelminthes



Characters :- 


(i) Body bilaterally symmetrical & dorsoventrally flattened.

(ii) Digestive system had a single opening or mouth, that leads to a well developed gastrovascular cavity absent & anus absent.


Class :- Tubellaria



Characters :-


(i) Turbellarian are mainly free living, aquatic, but there are some terristrial sp.

(ii) Hermaphrodite, with internal fertilization.



Example :- Planeria (free living)



Fig :- Planeria
Fig :- Planeria anatomy










Class :- Trematoda



Characters :-


(i) Body cylindrical or leaf shaped & parasitic.

(ii) Body is covered by cuticle, which provides protection against host enzyme action & defence mechanism.



Examples :- Fasciola; Schistosoma; Aspidogaster;




Fig :- Fasciola
Fig :- Schistosoma











Fig :- Aspidogaster












Class :- Cestoidea



Characters :-


(i) Endoparasitic helminth, whose body is covered by a syncytial tegument.

(ii) Organs of attachment in the form of hooks & suckers are present.



Examples :- Taenia; Echinococcus;




Fig :- Taenia
Fig :- Echinococcus










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