Contents and search bar Index of flora Index of fauna
	Kingdom Animale | Phylum Cnidaria (=Coelenterata)

Cnidarians on this site Order Rhizostomeae Rhizostome Jellyfish Order Hydroida Stinging Hydroids Order Madreporaria Hard Corals Order Alcyonacea Soft Corals Order Actiniaria Sea Anemone Stoichactis Banded Bead Anemone Eplactis Order Cerianthiaria Snakelock or Peacock Anemone Cerianthus Order Zoanthidae Colonial Anemones Order Semaeostomeae Sea Nettle Chrysaora melanaster Phylum Cnidaria They generally show radial symmetry and are flower-like. The single body opening which serves as both mouth and anus is usually fringed by tentacles bearing cells (nematocysts) which can sting and paralyse prey. They normally occur in two forms: polyps or hydroids (flower- like), which are stationary, and free-living medusae (left) (jellyfish-like). Some species occur in only one form throughout their life while others may show an alternation of generation (i.e., they occur as both hydroid and medusoid forms at different stages in their life). Hydroid stage (Order Hydroida)

Introduction Shore environment

From A Guide to Seashore Life by Dr Leo W H Tan and Peter K L Ng Published by the Singapore Science Centre and sponsored by BP @Raffles Museum of Biodiversity Research and Singapore Science Centre