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Invertebrates

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Invertebrates
Invertebrates
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Invertebrates

  1. 1. INVERTEBRATES
  2. 2. MAIN CHARACTERISTICS • They haven’t got a spinal column or an internal skeleton. • Invertebrates have got different body covering • Hard shell • Rigid covering  Exoskeleton • Without protection
  3. 3. MAIN GROUPS Mollusks Jellyfish and polyps Sponges Annelids Arthropods Echinoderms
  4. 4. • They have got a rigid body covering or exoskeleton. • Their bodies are divided into jointed parts. • They’ve also got jointed legs that they can bend.
  5. 5. THEY CAN BE SEPARATED INTO FOUR GROUPS: INSECTS • They have 6 legs. • Their bodies have 3 parts: head, thorax and abdomen. ARACHNIDS • They have 8 legs. • Their bodies are divided into 2 parts: cephalothorax and abdomen CRUSTACEANS • They have 10 legs and a very hard exoskeleton. • Their bodies are divided into 2 parts: cephalothorax and abdomen. MYRIAPODS • They have many legs. • Their bodies are divided into 2 parts: head and trunk. abdomen cephalotorax
  6. 6. • They’ve got a soft body. • Most mollusk have a hard Shell. They have also a thin layer next to their shell called the mantle. It protects their organs. • Many mollusks have a muscular foot which they use to move around.
  7. 7. THEY CAN BE SEPARATED INTO 3 GROUPS: BIVALVES • Have a Shell with 2 parts called valves. • Soft body and no head. • They are filter feeders (They filter water to extract nutrients) GASTROPODS • Can have a Shell or not. • They have a head and body and 4 tentacles. • Most of them are herbivores. CEPHALOPODS • They have a head with a mouth and well-developed eyes. • They have long arms to catch their food and some of them have tentacles. • Most of them are carnivores.
  8. 8. • Almost all of them live in the ocean. • Sponges can’t move around. They stay in one place. • They have a soft body with holes called pores. Sponges are filter feeders. They filter water through their pores to extract nutrients.
  9. 9. • Almost all of them live in the ocean. • They are carnivores. Jellyfish They float and swim in the ocean. The mouth is on the underside of the body. Polyps They have a body that is shaped like a bag. They have a suction cup at one end of their body to anchor themselves to the floor.
  10. 10. • They live in the ocean • They have many tiny feet with suction cups. They use these feet to move across the ocean floor.

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