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Invertebrates

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Invertebrates

  1. 1. INVERTEBRATES (ANIMALS WITHOUT BONES)
  2. 2. - Protozoa - Annelids - Mollusks - Echinoderms - Crustaceans - Arachnids - Insects Types of Invertebrates:
  3. 3. Protozoa - Protozoa are simple, single-celled animals. - They are the smallest of all animals. - Most protozoa are microscopic in size, and can only be seen under a microscope. - Protozoa take in oxygen and give off carbon dioxide through the cell membrane.
  4. 4. Annelids - They have bodies that are divided into segments. - They have very well-developed internal organs. - They don't have any limbs. - They are about 9,000 species of Annelids
  5. 5. Mollusks • First inhabitants of the Earth. • Mollusk fossils are usually well preserved because of their hard shell (over 500 million years) • Most mollusks have a soft, skin-like organ covered with a hard outside shell. • Some mollusks live on land, such as the snail and slug. • Other mollusks live in water, such as the oyster, mussel, clam, squid and octopus.
  6. 6. Echinoderms - Marine animals that live in the ocean. - Sea star, Sea Urchin, Sand Dollar and Sea Cucumber. - Arms or spines that radiate from the center of their body. - The central body contains their organs, and their mouth for feeding. - Sea stars have 5 or more arms attached to their body.
  7. 7. Crustaceans • Crustaceans have a hard, external shell which protects their body. • Crustaceans have a head and abdomen. • The head has antennae which are part of their sensory system. • The abdomen includes the heart, digestive system and reproductive system.
  8. 8. Arachnids • Arachnids are a type of arthropod • Common arachnids are spiders, scorpions, ticks and mites. • They have a hard exoskeleton • Most arachnids have 4 pairs of legs. In some, the first pair of legs may be used for holding their prey and feeding. • Unlike other arthropods, arachnids do not have antennae.
  9. 9. Insects - Insects are the largest group of arthropods. - Insects are very adaptable, living almost everywhere in the world. - Common insects include the fly, beetle, butterfly, moth, dragonfly, bee, wasp and praying mantis. - Insects have an exoskeleton that covers their entire body. - An insect's body consists of 3 parts: the head, thorax and abdomen.
  10. 10. Thanks for watching •By Giada and Cris C.

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