Department of Zoology at ANDC/Zoology Museum/Museum specimens/Cnidaria/Hydra

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{|cellpadding="5" cellspacing="6" style="width:100%;background:#FFFFFF; border-style:solid; border-width:3px; border-color:#0066FF;" Date & Time : 28, August 2024      
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=Classification=

Phylum - Cnidaria

Class - Hydrozoa

Order - Hydroida

Genus - Hydra

=Geographical Distribution=

Cosmopolitan, but most common in India, Canada and U.S.A.

=Habitat=

It is freshwater solitary animal found attached to some objects in ponds, lakes and streams.

=Identifying Features=
 * Hydra is elongated, cylindrical and measures 1-3cm in length.


 * Proximal end of body is known as Basal disc or foot, and is used for locomotion.


 * The free distal end bears mouth situated on a conical elevation called the Hypostome.


 * Hypostome is encircled by 6-10 tentacles which are finger-like, hollow projection provided with nematocytes.

=Common Characters=
 * Body wall is Diploblastic.
 * Digestive cavity or GASTROVASCULAR CAVITY is enclosed by body wall.


 * Reproduction by both sexual and asexual means.


 * Gonads appear as buds on the sides of body.


 * Testes lie near the oral end and ovaries near the base.