Phylum: Cnidarians.

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Presentation transcript:

Phylum: Cnidarians

What is a Cnidarian? A cnidarian is an invertebrate It uses stinging cells to capture prey Examples: Jellyfish Corals Sea Anemones

Body Structure All cnidarians have the following characteristics: Radial symmetry A hollow central cavity Tentacles with stinging cells However, cnidarians can have one of 2 different body plans. Polyp Medusa

Body Plans Polyp Mouth opens at top Vase-shaped Attached to a surface Examples: Hydra, Sea anemone, Coral Medusa Mouth opens down Tentacles point down Adapted for a swimming life Examples: Jellyfish

Activity: Color Code a Cnidarian Endoderm Tentacle Jelly-like layer (Mesoglea) Ectoderm Tentacle

Obtaining Food Stinging cells inject venom which paralyzes the prey THINK! – Why are clown fish resistant to the toxins given off by sea anemones? Tentacles pull the prey into the mouth Digestion happens in the body cavity Waste is expelled back out through the mouth

Movement Cnidarian movements are directed by nerve cells that spread throughout the cnidarians body like a basketball net Jellyfish swim through water Hydras can be found in freshwater and turn somersaults or use their tentacles to move Watch these Hydra Movies http://micro.magnet.fsu.edu/optics/olympusmicd/galleries/moviegallery/pondscum/coelenterata/hydra/index.html Sea anemones stretch out, shrink down, and bend slowly from side to side

Reproduction Asexual Sexual Budding is most common in hydras, corals, sea anemones where these polyps just pull apart forming two new polyps. Sexual Can occur during the life cycle of certain cnidarians such as the jellyfish

Life Cycle of A Jelly Fish

Life on a Coral Reef Coral polyps produce a hard, stony skeleton around its soft body once attached to a hard surface. Coral polyps then continue to reproduce asexually Over time, reefs build up from the sea floor and make great homes for other sea life

Video Quiz Watch the following clip: Coral Ecosystems (5:59) There will be a short video quiz following the clip. Make sure to take good notes! You can use your notes for the video quiz!