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Phylum Porifera Sponges Phylum Cnidaria Jellyfish, corals..... Slide 2 Dont forget sponges are animals and belong to the Animal Kingdom 1. Multicellular 2. No organs or body systems 3. Cellular digestion (heterotrophic) 4. Asymmetry Slide 3 Sponges are SESSILE they do not move They obtain food by FILTER FEEDING Slide 4 Reproduce sexually (sperm and eggs) Reproduce asexually (regeneration) Skeleton composed of spongin (soft) and spicules (hard) Slide 5 Sponge Anatomy Slide 6 Slide 7 Amebocytes - cells within the sponge that move around supplying nutrients and taking away waste Slide 8 CHOANOCYTES collar cells layer of cells with flagella the movement of the flagella keeps a water current going in the sponge food vacuoles in the collar cells digest plankton and other small organisms (filter feeder) Slide 9 Slide 10 Cnidarians - jellyfish, coral, hydra, sea anemone *Named after the stinging cells found on their tentacles called CNIDOCYTES Slide 11 Characteristics of Cnidarians Tentacles Cnidocytes (stinging cells) Slide 12 Nematocysts (barbs) Gastrovascular cavity (digestion) Slide 13 Most Cnidarians have radial symmetry Slide 14 Cnidarians have two body forms: polyp (vase shaped) medusa (cup shaped) Slide 15 Portuguese Man of War - cnidarian that floats in the water and has long tentacles Slide 16 Slide 17 Video: Jellyfish Scene from NemoJellyfish Scene from Nemo Slide 18 The Hydra is a freshwater cnidarian What kind of symmetry does hydra have? Is it a medusa or a polyp? Slide 19 Video of hydra at http://www.microscopyu.com/moviegallery/pondscum/hydra/ http://www.microscopyu.com/moviegallery/pondscum/hydra/ Slide 20 Hydra Anatomy (printable)printable WORD BANK Gastrovascular cavity Tentacle Cnidocyte Ectoderm Endoderm Mesoglea Ovary/Teste Bud Nematocyst Mouth Basal Disk Slide 21 Coral Reefs are made from the skeletons of cnidarians Slide 22 Slide 23 Slide 24 Multimedia Sponge Video Jellyfish Jellyfish and Cousins