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Saturday 9 March 2013

Classification of Phylum Nematoda according to Ruppert & Barnes(1994)


Phylum :- Nematoda


Characters :- 


(i) They have perfectly cylindrical body adapted for living in minutes place.

(ii) Body cavity is pseudocoel, Cuticle thick & tough.

(iii) Circular muscle is absent, longitudinal muscles in 4 groups.

(iv) Anterior end bear sense organ amphid & posterior phasmid present.



Class :- Aphasmida



Characters :-


(i) Anterior end of body bear chemo receptor amphids, phasmid absent posteriorly.

(ii) Most are free living animal.

(iii) Excretory system relatively simple types.

(iv) Presence of cephalic setae & papillae.



Examples :- Trichurus; Trichenella;


Fig :- Trichenella

Fig :- Trichurus












Class :- Phasmida



Characters :-


(i) Possess anteriorly Amphids & posteriorly Phasmid.

(ii) Most are parasitic.

(iii) In the caudal region there is the presence of a pair of Phasmid.



 Examples :- Ascaris; Wuchereria; Ancylostoma;



Fig :- Ascaris
Fig :- Wuchereria bancrofti

Fig :- Ancylostoma






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