Cnidarians Jellies, Anemones, Corals Dimorphism: Two body shapes during life cycle. (Polyp & Medusa) Gastrovascular cavity Primitive nerve net Two distinct tissue layers: Epidermis & Gastrodermis Cnidocyte (Stinging cells) Radial Symmetry

Life cycle Reproduction : Most cnidarians reproduce both sexually and asexually.

Classes of Cnidaria Scyphozoa (Cup Animals) Hydrozoa (Serpent Animals) Anthozoa (Flower Animals)

Scyphozoa Scyphozoa True jellies Medusa form during most of its life cycle. Lions Mane is the most common in L.I.S. Butter fish lives in its tentacles.

Sea Wasp Known as box jellyfish Most powerful venom in the world Lives in Australia Can be up to 60 meters in length

Hydrozoa Both body plans: polyp and medusa Reproduce sexually as medusas. Example: Portuguese Man Of War

Anthozoa They are individual or colonies of polyps found in coastal waters. No swimming medusa stage. Examples: Sea anemones,Hard corals, sea fans

Sea fans

Hard corals

Phylum: Ctenophora Ctenophores Common name: Comb jellies Contain eight rows of comb plates made of cilia used for locomotion. Bioluminescent No stinging cells They feed on plankton

Comb Jellies

Candiru