Class lllrd

Hirudinea

Hirudiy=a leech)*

>Mostly ectoparasitic and freshwater forms, while few are marine feeding upon fishes and other animals.
>Body is elongated usually flattened dorsoventrally or cylindrical.
>Body consist of definite number of segments each segment breaks up into 2 to 4 rings or annuli.
>Parapodia and setae are absent.
>Body is provided with an anterior and a posterior sucker, both situated ventrally.
>Mouth opens on the ventral surface in the anterior sucker, while anus opens dorsal to the posterior sucker.
>Hermaphrodite.
>Asexual reproduction is not known.
>Eggs are usually laid in cocoons*
>Development is direct without free swimming larval stage.
Class Hirudinea include three orders:-
Order i.Acanthobdelid :- e.g. Acanthobdeilida
Order ii.Rhynchobdellida:- e.g. pontobdella,Glossiphonia,Branchellion,piscicola.
Order iii. Gnathobdellida:- Hirudo,Haemopis,Hirudinaria,Herpobdella.*
*जोंक
* Reproductive area
*Important topic

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