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INVERTEBRATES

INVERTEBRATES. Animals that do not have bones So They don’t have a skeleton or a backbone. 1.- Classification. Invertebrates are classified into smaller groups. Sponges Cnidarians Echinoderms Worms Molluscs Arthropods. SPONGES. They are the simplest type of animal that exits.

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INVERTEBRATES

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  1. INVERTEBRATES Animals that do not have bones So They don’t have a skeleton or a backbone

  2. 1.- Classification • Invertebrates are classified into smaller groups. • Sponges • Cnidarians • Echinoderms • Worms • Molluscs • Arthropods

  3. SPONGES • They are the simplest type of animal that exits. • They cannot move.They attach themselves to rocks or the sea floor. • They are often irregular in shape. • Their bodies have lots of small holes that allow water to pass in and out. • They eat microscopic organisms in the water that they filter through their body.

  4. CNIDARIANS • Cnidarians have jelly-fish like bodies. • They are aquatic animals. • They have very simple bodies with an opening at one end.This opening acts like a mouth and an anus. • They have soft tentacles that can sting you. • Some, such as coral and sea anemone, attach to rocks. Others, such as jellyfish, can move about. • Many cnidarians like jellyfish and sea anemones have a poisonous substance in their tentacles to catch their prey. • Jellyfish Sea anemone white coral

  5. ECHINODERMS • Echinoderms are symetrical. • Starfish tipically have 5 or more arms which radiate from a central point where their mouth is. • Echinoderms are invertebrates with hard plates under their skin.Some like sea urchins have movable spines on the outside of their bodies. • They live in the bottom of the sea. • Starfish • Sea urchins

  6. WORMS • Worms are animals with long, soft bodies and moist skin. • They do not have legs. • They move by wriggling. • Most live in the sea or in fresh water. Some live on land like earthworms. • Some worms are parasites. They live in the intestines of other animlas and eat their food.

  7. MOLLUSCS • Molluscs are classified into 3 groups. Gastropods. Bibalves. Cephalopods.

  8. GASTROPODS • Gastropods usually have a shell where they hide in when they sense danger. • They move by sliding on a slimy, mucus substance that they excrete. snail

  9. BIVALVES • Bivalves have one shell divided into 2 moving parts called valves, which they close when they sense danger. They usually stay in one place. They eat small organisms that are in the water. mussel clams oyster

  10. CEPHALOPODS • Cephalopods have no protective external covering but some have a shell hidden under their skin. • All cephalopods are marine animals. • They have eight or ten tenctalces that help them to swim and catch teir prey. octopous squid cuttlefish

  11. ARTHROPODS • Arthropods have an external skelenton called exoskeleton which supports and protects the body. • Classification: Crustaceans Arachnids Myriapods Insects.

  12. CRUSTACEANS • Most of them live in the sea. • They usually have 10 legs • The exoskeleton is very hard. lobster crab prawns

  13. ARACHNIDS • Arachnids ar terrestrial and carnivorous. • Arachnids have 8 legs. spider scorpion

  14. MYRIAPODS • Myriapods have many legs in their bodies. centipedes millipedes

  15. INSECTS • Insects have 6 legs. butterfly • Many insects have wings. • Their body is divided into 3 parts:head, thorax and abdomen. fly mosquito grasshopper bee wasp

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