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Invertebrates

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Invertebrates
Invertebrates
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Invertebrates

  1. 1. INVERTEBRATES (animals with no backbone)
  2. 2. Animal Kingdom It is made up of multicellular eukaryotic organisms. They are heterotrophs and present interaction with the environment. o Invertebrates. Some have no skeleton and others have an external skeleton (exosqueleton) o Vertebrates. With a skeleton or endoskeleton
  3. 3. Invertebrates • Porifera • Cnidaria. Jellyfish • Anelids. Earthworm • Molluscs ▫ Gasteropods. Garden snail ▫ Bivalves. Mussel ▫ Cephalopods. Octopus • Arthropods Insects. Fly Crustaceans. Crab Myriapods. Centipede Arachnids. Spider • Echinoderms. Starfish
  4. 4. Porifera Sponges are the best example of this group. • Their bodies are full of pores and channels • They feed by filtration • Sponges do not move around
  5. 5. Cnidaria Jellyfish, corals and sea anemones • Most of them live in the sea • They have tentacles • Cnidaria are carnivorous (use the tentacles to capture their prey. • They have sexual and asexual reproduction anemone jellyfish
  6. 6. Annelids Earthworms and leeches • Soft, cylindrical body divided into segments (called metameres) • They usually live in water and some are parasits (leeches) Lumbricus terrestris Earthworm Leech
  7. 7. Annelids
  8. 8. Molluscs• A soft body divided into: ▫ Head ▫ Body mass ▫ Muscular Foot • Body covered with a membrane: the mantle • They sometimes have a shell, made up of 1 or 2 valves • Respiration: gills or lungs • Nutrition: carnivores and herbivores • Metamorphosis
  9. 9. Molluscs I Gasteropods: spiral-shaped shell. Exception: slugs have no shell ▫ Slugs ▫ Snails
  10. 10. Molluscs II Bivalves: Their shells have two valves Mussels Clams Cockles Oysters
  11. 11. Molluscs III Cephalopods: they have tentacles but do not have shell Squid Octopus Cuttlefish
  12. 12. Arthropods Four groups: Insects. Fly Crustaceans. Crab Myriapods. Centipede Arachnids. Spider Segmented body covered by a exoskeleton Body divided into 3 partes: head,thorax and abdomen Nutrition: Herbivorous, carnivorous or scavengers Respiration: They breath through trachea or gills Reproduction: oviparous Metamorphosis
  13. 13. Arthropods I • Crustaceans. Usually 10 legs. Aquatic Crab Lobster
  14. 14. Crustaceans
  15. 15. Arthropods II • Myriapods. Worm like body. Many legs. Terrestrial scolopendra millipedes
  16. 16. Arthropods III • Arachnids. 8 legs. Terrestrial. Spiders and scorpions
  17. 17. Arthropods IV • Insects. 6 legs, 2 antennae, 2/4/no wings Butterfly Ant Wasp Bee
  18. 18. Echinoderms  Radial symmetry  Body shape: rounded, cylindrical or like a star  Movement: ambulacral feet  Nutrition: carnivorous  Reproduction: Most have male and female sexes. Some are hermaphrodite
  19. 19. Brittle star Sea urchin Starfish Sea cucumber
  20. 20. THE END

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