Invertebrates

• Invertebrates - Refers to animals without backbone
• Invertebrates - They range in size from microscopic mites and almost invisible flies to giant squid
• Phyllum Annelida - The segmented worms. (Ragworms, earthworms and leeches)
• Phylum Annelida - The species exist in and have adapted to various ecologies ( Latin: anellas -little ring)
• Phylum Arthropoda - Jointed appendages- which include legs, antenna, claws, pincers
• Phylum Anthropoda - Hard external skeleton - exoskeleton made of chitin
• Phylum Anthropoda - Many are toxic (Insects, spiders, scorpions, centipedes and millipedes on land , Crabs,crayfish,shrimp,lobsters,baraccles in water)
• Phylum Anthropoda - Most have separate sexes and reproduce sexually
• Phylum Cnidaria - moslty marine (Corals, hydras, jellyfish, portuguese men of war, sea anemone corals)
• Phylum Cnidaria -  Some are solitary (sea anemone) others are colonial (corals)
• Phylum Echinodermala - They have a star-like appearance and are elongated
• Phylum Echinodermala  - They are exclusively marine animals
• Phylum Enchinodermala - they are spine -sarned 
• Phylum Enchinodermala - The skeleton is made up of calcium (Sea stars, sand dollars, feather stars, star fish, brittle stars, sea lilies,

  sea cucumbers, sea urchins, sea weeds)
• Phylum molluska - Soft-bodied organisms
• Phylum Molluska - Found in marine and freshwater
• Phylum Molluska  - Body is covered by calcareous shells (Snails, squids, oysters, clams, muscles, all belong to phylum mollusca                                    (octopus)
• Phylum Nematoda - The roundworms
• Phylum Nematoda -They are unsegmented
• Phylum Nematoda - Have separate sexes and appearances
• Phylum Nematoda -Free living (majority) or parasites of humans, plants and animals (Ascarsis, hookworm, whipworm, tapeworm, pinworm)
• Phylum Platyhelminthes - The flatworms
• Phylum Platyhelminthes - Two greek words: Platy - meaning flat and  Helminth - meaning worm
• Phylum Platyhelminthes - Mostly parasitic ( Flatworms, flukes, planarians)
• Phylum Porifera - Sponges & Pore bearers
• Phylum Porifera - Reproduce sexually and asexually
• Phylum Rotifera - Known as wheel animals or wheel animalcules
• Animal Hair - provode guard, protection, warmness and sensation to animal
• Animal Hair -  serves as thermoregulation 
• Animal Hair - protects the body from damage