1 / 14

Invertebrates

Invertebrates. Sponges & Cnidarians. Sponges. Kingdom: Animalia Phylum: Porifera (sponges) Simplest invertebrates Asymmetrical (no symmetry!) No tissues, gut or nerves. How Do Sponges Eat?. Filter feeders: feed on tiny plants and animals

lneidig
Download Presentation

Invertebrates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Invertebrates Sponges & Cnidarians

  2. Sponges • Kingdom: Animalia • Phylum: Porifera (sponges) • Simplest invertebrates • Asymmetrical (no symmetry!) • No tissues, gut or nerves

  3. How Do Sponges Eat? • Filter feeders: feed on tiny plants and animals • Water carries food into the sponge through pores (ostia) • Ostia: holes on the outside of the body • Inside the sponge, collar cells remove food from the water • Collar cells: special cells that line the central cavity of the sponge; they digest food • The water exits through an osculum • Osculum: hole at the top of the sponge

  4. Sponge Anatomy • Where does the water enter? • Where does the water exit? • What structure on the collar cells pushes the water up?

  5. Body Part Abilities • If a part of a sponge is broken off, the missing part can regenerate, or grow back • If a sponge is broken into pieces, new sponges could form from each piece • If you force a sponge body through a strainer, the separated cells could come back together and reform the same sponge!

  6. Kinds of Sponges • All live in the water (most in salt water) • Come in different shapes/sizes • Most sponges have a skeleton made of hard fibers called spicules • Grouped by their type of skeleton • Barrel sponge • Tube Sponge • Finger Sponge • Vase Sponge

  7. Cnidarians • Pronounced “nigh-dare-e-ins” • Kingdom: Animalia • Phylum: Cnidaria • Invertebrates that have stinging cells • More complex than sponges • Have complex tissues, a gut & simple nerves • Include: jellyfish, hydrozoa, sea anemones and coral

  8. Two Body Forms • Cnidarians have ONE of the two body forms: • Medusa: swim through the water • Polyp: attach to a surface • Some change forms at different times in their life

  9. Special Cells • All cnidarians have tentacles covered with stinging cells • Nematocysts: stinging cells that release spears into an organism when it brushes the tentacles • Some can release poison • Used for protection and to catch food

  10. Kinds of Cnidarians **We split them into four classes: Kingdom: Animalia Phylum: Cnidaria Class: Hydrozoa Scyphozoa Anthozoa Cubozoa

  11. Hydrozoans • Hydra, Portuguese Man-o’War • Hydra are always polyps (attached) • Live in fresh and salt water • Many live in colonies

  12. Scyphozoans • Jellyfish • Catch other inverts and fish in tentacles • Spend most of their life as a medusa

  13. Anthozoans • Sea Anemones and Corals • Spend their lives as polyps • Often brightly colored • Live in colonies

  14. Cubozoans • Are square shaped when viewed from above • Resemble true jellyfish • Have well developed eyes • Are one of the most deadliest animals in the ocean

More Related