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Invertebrates juanje

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Invertebrates lucia
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Invertebrates juanje

  1. 1. BY:Juanje Ortega Lara
  2. 2. Invertebrates characteristics  The main characteristics of invertebrates is that they haven´t got a spinal column or an internal skeleton.  Some invertebrates ,have got a hard shell to protect themselves.  Other invertebrates ,have got a rigid covering called an exoskeleton.  Some invertebrates ,have got a soft body without protection.
  3. 3. Main groups of invertebrates.  Mollusks  Mollusks have got soft body ,but most of them have got a hard shell too.
  4. 4. Jellyfish and Polyps  They ´have got a soft body. Some of them have got long tentacles .
  5. 5. Sponges  They´have got a soft body whit holes called pores .
  6. 6. Annelids  They ´have got a long, soft body that is divided into rings called segments.
  7. 7. Arthropods  They´have got an exoskeleton and jointed legs that bend . They include insects ,spiders and crustaceans.
  8. 8. Echinoderms  Their bodies are covered whit sharp spikes . Some echinoderms have got arms and tentacles .
  9. 9. More arthropods  Arthropods are the most numerous group of invertebrates . Some invertebrates live in water ,other invertebrates live on land . Many arthropods can also fly.  They ´have got an exoskeleton.  Their bodies are divided into jointed parts.  They ´have also jointed legs .
  10. 10. Insects  Insects have got six legs . Their bodies have got three main parts : the head , thorax and abdomen . Many insects have got wings .
  11. 11. Arachnids  Arachnids have got eight legs . Their bodies are divided into two main parts ; the cephalothorax and the abdomen.
  12. 12. Crustaceans  Crustaceans have got ten legs . Their bodies are divided into two main parts : the cephalothorax and the abdomen .
  13. 13. Myriapods  Myriapods have got many legs. Their bodies are divided into two main parts : the head and the trunk.
  14. 14. More mollusks  They ´have all got soft bodies .  Most mollusks have got a hard shell and a thin layer next to their shell called the mantle .
  15. 15. Mollusks  Bivalves  Bivalves have got a shell whit two parts , called valves .  They´have got a soft body and no head.  Bivalves are filter feeders . They filter water to extract nutrients.
  16. 16. Mollusks  Gastropods  Many gastropods, have got a spiral shell . Other gastropods ,haven´t got a shell.  Gastropods have got a head and body . They ´have also got four tentacles.  Most gastropods are herbibores .
  17. 17. Mollusks  Cephalopods  Cephalopods have got a head whit a mouth and well- developed eyes .  They ´have also got long arms to catch their food. Squid have got tentacles too.  Most cephalopods are carnivores.

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