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Invertebrate Characteristics

Invertebrate Characteristics. Symmetry- Bilarteral or Radial Segmentation- repeating similar units Exoskeleton-rigid outer covering which protects the soft tissue of many animals. Gas exchange (respiration) occurs through body cavities, but some have gills.

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Invertebrate Characteristics

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  1. Invertebrate Characteristics • Symmetry- Bilarteral or Radial • Segmentation- repeating similar units • Exoskeleton-rigid outer covering which protects the soft tissue of many animals. • Gas exchange (respiration) occurs through body cavities, but some have gills. • Some have an open circulatory system. Some have a closed circulatory system (loop) • Reproduction- sexual and asexual. Some invertebrates are hemaphrodites. • A hemaphrodite is an organism that produces both male and female gametes allowing a single organism to function as both male and female

  2. INVERTEBRATESPorifera, Cnidarians, Ctenophora • Phylum Porifera • Sponges • In animal kingdom because of cell recognition: separated cells can regroup into a new sponge. • Phylum Cnidaria • Hydra: live in freshwater. Hermaphroditic sexual reproduction. • Stinging jellyfish: some carry poison • Flowerlike coral: provide food and shelter for fishes • Medusa • Anemones: show a symbiotic relationship with the clownfish. The two animals share food and protect each other from predators. • The movements of the clownfish prevent sediments from burying the anemone • The clownfish produces mucus that prevents the anemone from firing poison to the clownfish. • Phylum Ctephanophora • Bioluminescent ctenophore. Bioluminiscence is the production of light by a chemical reaction.

  3. INVERTABRATESPlatyhelminthes,Nematoda, • Phylum Platyhelminthes • Planarian • Flukes (Blood flukes called Schistosoma common in Asia, Africa, and South America – cause deadly disease- schistosomiasis) • Flatworms (Tapeworm : Taenia saginatus (beef) Taenia solium (pig) • Phylum Nematoda • Roundworms – • Hookworms • Ascaris • Trichinella (pork) • Pinworm • Filarial worms (elephantiasis)

  4. Invertebrates Mollusca • Phylum Mollusca- have soft bodies and some have a hard shell to protect them. • Clams • Snails • Octopuses • Squids

  5. Invertebrates Annelida • Phylum Annelida- Annelid means ¨little rings¨ The name is after the many segments that make the annelid look like a series of rings. • Common Earthworms • Bloodsucking leeches- parasites that suck blood from other animals.

  6. INVERTEBRATESArthropoda • Subphylum Chelicerata • Class Arachnida • Scorpions- Spiders • Subphylum Crustacea • Class Malacostraca • Shrimps, crabs, lobsters • Subphylum Myriapoda • Class Chilopoda-Dipoploda • Centipede- Millipides • Subphylum Hexapoda • Class Insecta • Insects

  7. INVERTEBRATESECHINODERMS • Phylum Echinoderm • Sea stars • Sea urchins • Sand dollars • Sea cucumbers

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