1. Sponges and Cnidarians ©2008 susan anderson

2. Sponges Adults do not usually move (sessile) Take food into their bodies to digest. One of the oldest living animals (540 million years) Belongs to the phylum Porifora (has pores) Can regenerate

3. Sponge Structure Pores – where water enters Collar Cells – help move water and catch food. Jelly like cells – help digest and distribute food, carry wastes, form egg and sperm Spikes/Spicules – in some, give support Osculum – where water exits, sometimes carrying the young.

4. Structure of a Sponge Structure of a Sponge

6. Sponge Reproduction Reproduce both sexually and asexually –B–B–B–Budding A new small sponge grows from the old –S–S–S–Separate Sexes Egg and sperm cells are created Water currents carry the sperm cells that move in through the pores of an egg-bearing sponge Egg develops into a larva (immature form) These larva swim through the water until it attaches to something to grow into an adult

7. Cnidarians Carnivores that use their stinging cells (cnidocytes) to capture prey and protect themselves. Have specialized tissues One of two body plans –P–P–P–Polyp –M–M–M–Medusa Reproduce both asexually and sexually

8. Examples of Cnidarians Jellyfish Sea anemones Coral Hydra

9. Worms Three major phyla –P–P–P–Platyhelminthes (flatworms) –N–N–N–Nematodes(roundworms) –A–A–A–Annelida (segmented worms) Simplest organisms with a brain –A–A–A–Allows them to detect food, predators, and mates very quickly and respond Reproduction –B–B–B–Both asexual and sexual –R–R–R–Regeneration

10. Platyhelminthes Most are parasites Examples –T–T–T–T aaaa pppp eeee wwww oooo rrrr mmmm ssss –P–P–P–Planarians

11. Nematodes Most are tiny and hard to see Are found in most all moist environments Carnivores, herbivores, and parasites “Tube within a tube” digestive system Examples –A–A–A–Ascaris –H–H–H–Hookworms

12. Annelids Have bodies made up of many segments Closed circulatory system Parasites, herbivores, scavengers, predators Most live in burrows or tubes Examples –L–L–L–Leeches –S–S–S–Sea floor worms –E–E–E–Earthworms

13. Earthworm Structure Bristles/Setae Clitellum Mouth Esophagus Crop Gizzard Intestines Brain Ventral nerve cord Hearts Blood vessels

14. Earthworm Structure Earthworm Structure