Transcript Cnidarians
Daily Activity 4-12-2012 • Get out your notebooks and be prepared to take notes on Cnidaria. Phylum Porifera Sponges Phylum Cnidaria Jellyfish, corals ..... • Don’t forget – sponges are animals and belong to the Animal Kingdom 1. Multicellular 2. No organs or body systems 3 . Cellular digestion (heterotrophic) 4. Asymmetry Sponges are SESSILE – they do not move They obtain food by FILTER FEEDING Reproduce sexually (sperm and eggs) Reproduce asexually (regeneration) Skeleton composed of spongin (soft) and spicules (hard) Sponge Anatomy Amebocytes - cells within the sponge that move around supplying nutrients and taking away waste Pacific Northwest Locals Purple Sponge Cnidarians - jellyfish, coral, hydra, sea anemone *Named after the stinging cells found on their tentacles called CNIDOCYTES Characteristics of Cnidarians · Tentacles · Cnidocytes (stinging cells) · Nematocysts (barbs) · Gastrovascular cavity (digestion) Most Cnidarians have radial symmetry Cnidarians have two body forms: polyp (vase shaped) medusa (cup shaped) Portuguese Man of War - cnidarian that floats in the water and has long tentacles Pacific Northwest Locals Fish Eating Anemone Giant Lion’s Mane Jellyfish White Spotted Rose Anemone Egg Yolk Jellyfish Crimson Anemone http://www.calvintang.com/blog/2007/06/giant-jellyfish The Hydra is a freshwater cnidarian What kind of symmetry does hydra have? Is it a medusa or a polyp? Hydra • Predatory animals • They can be found in most unpolluted freshwater ponds, lakes, and streams in the temperate and tropical regions and can be found by gently sweeping a collecting net through weedy areas. • Hydras are generally sedentary or sessile, but do occasionally move quite readily, especially when hunting. Video of hydra at http://www.microscopyu.com/moviegallery/pondscum/hydra/ Pacific Northwest Locals Pink Mouth Hydroid Coral Reefs are made from the skeletons of cnidarians Pacific Northwest Locals Soft Coral Cup Coral Multimedia Sponge Images and Videos http://www.junglewalk.com/video/Sponge-movie.htm Cnidarian Images and Videos http://www.junglewalk.com/video/Coelantrate-movie.htm General Invertebrate Movies at National Geographic --- really good video on the portuguese man of war (under invertebrates) Hydra Video at http://www.schooltube.com/video/55045/Hydra