Bioniac

Phylum - Coelenterata(Cnideria) •  Aquatic,   Mostly   marine,   Sessile  or free swimming   • Radially   symmetrical animals • Cnideria name is derived from Cnidoblast   or Cnidocytes   •  Cnidoblast   cells   contain Stinging   capsule   or NEMATOCYST      Structure of Nematocyst cell • Cnidoblast   cells   are present on tentacles   and body and used for anchorage,   defense,   prey   capturing . • Cniderians have a central gastro-vascular   cavity   with a single opening. • Mouth in Cniderians is present of HYPOSTOME . • Extracellular  and Intracellular   digestion. • Some Cniderian live Coral   have a skeleton composed of  calcium carbonate   (CaCO3) • Two basic body form is shown named polyp   and medusa . • Polyp   stage is Sessile,   Cylindrical e.g. Hydra ,  Adamsia etc. • Medusa   stage is ...