Invertebrates

• Arthropods are invertebrates with jointed legs and an exoskeleton
• Exoskeleton is a skeleton outside of the body that allows them to live on dry lamd. It is made up of a Chemical called Chitin
• Arthropods consist of:

  • Insects
  • Crustaceans
  • Myriapods
  • Arachnids
• Characteristics of insects:

  • Body divided into 3 parts (head, thorax abdomen)
  • Usually have wings
  • Have one pair of antennae
  • Have compound eyes
• Characteristics of Crustaceans:

  • Two pairs of antennaes
  • Three pairs of mouth parts
  • Often exoskeleton made up of calcium with salts (protects and makes them heavy)
• Characteristics of Myriapods:

  • One pair of antennae
  • One or two pair of legs attached to every segment
• Characteristics of Arachnids:

  • Body divided into two parts (head thorax and abdomen)
  • Four pairs of jointed legs joined to the cephalothorax
  • No antennae
• Examples of Crustaceans are:

  1. Crabs
  2. Lobsters
• Examples of Myriapods are:

  1. Centipedes
  2. Millipedes
• Examples of Arachnids are:

  1. Scorpions
  2. Spiders