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                      PHYLUM;  COELENTERATA

                              CLASS  ;  HYDROZOA

                                EXAMPLE ;  HYDRA

 

 

Phylum coelenterata    is  a group of  aquatic  or marine  organisms. They  found  attached  to rocks  at  the  bottom  of the sea They  are multicellular and  simplest  group  of  invertebrates.  This phylum is  otherwise  called as  Cnidaria.  Coelenterata  is divided  into  three  classes namely  Anthozoa,   Hydrozoa  , and  Scyphozoa.  Hydra  is     coming   under the class Hydrozoa. Body  is  radial  symmentry  in nature.  It  has stinging  cells  and  a  digestive  cavity . Hydra  are small  freshwater  polyps  found  attached  to vegetation in ponds ,feathering  tentacles  around a central mouth  to capture prey  like  insects.