Phylum Porifera Sponges – the simplest animal
Porifera • most ancient group of animals (500 mya) • multicellular • heterotrophic • a few specialized cells • asymmetrical • invertebrate
Porifera • means “pore bearers” since they have tiny openings all over body • filter feeder - eat tiny, floating organic particles and plankton • food and oxygen in, waste out • sessile - live permanently attached to a location in the water
Phylum Cnidaria Jellyfish, sea fans, sea anemones, hydras, & corals Lions mane jellyfish - grows up to 8ft across the tentacles can be over 100ft long
Cnidaria • aquatic organisms • radial symmetry • invertebrate • central mouth • coral polyps build calcium carbonate structures coral reefs • stinging cells (nematocysts) are arranged on tentacles and used to capture food (small planktonic animals)
Cnidaria • some individual, some colonial
Use Ch 26 and match the correct phylum, picture and description.