All About Arthropods!

By Leighanne Masri

Vu - PAP Bio - Per.4

Lab Pictures!


In this presentation you will learn:

  • All about grasshoppers and crayfish
  • External and internal anatomy
  • Interesting facts
  • Body systems
  • Key information

Grasshopper: Background Information/ Ecology

Scientific name:



Grass, meadows


  • Birds
  • Frogs/ Toads
  • Snakes
  • Mice
  • Spider


  • Grass
  • Leaves
  • Cereal crops
  • Other plants


  • Hard exoskeleton for protection
  • Camouflaged to hide from predators
  • Long hind legs used to jump away from enemies
  • Very sharp hearing
  • Special breathing holes
  • Spray their predators for protection

Human Impact/ Influence


The role of a grasshopper is to:

  1. Fertilize it's surroundings with it's droppings (frass)
  2. Return nutrients to soil
  3. Serve as food
  4. Swarm and feed off crops


Grasshopper Anatomy Part 1
Grasshopper Anatomy Part 2

Crayfish: Background Information/ Ecology

Scientific name:




  • Fresh water habitats
  • Lakes
  • Ponds
  • Rivers


  • Opossums
  • Owls
  • Foxes
  • Snakes
  • Turtles
  • Yellow perch
  • Blue gill fish
  • Muskrats


  • Shrimp
  • Fish
  • Worms
  • Insects
  • Snails
  • Plants


  • Evolved to live in freshwater instead of the ocean
  • Sensitive antennae, to detect movement in the water
  • Four legs to walk on land
  • Pincers to fight off predators
  • Hard shell
  • Molt exoskeletons as they grow
  • Camouflage exoskeletons
  • Re-grow appendages (pincers and legs) when they lose them
  • Large spectrum of vision

Human Impact/ Influence

Niche [Human Relations]

The role of a crayfish is to:

  1. Omnivoric scavenger
  2. Eat aquatic organisms
  3. Provide food for predators


Crayfish Anatomy Part 1
Crayfish Anatomy Part 2

Body System Focus

Grasshopper: Respiratory System

The respiratory system in a grasshopper is called the tracheal system. This is the exchange of gasses in a grasshopper. A similarity that a grasshopper has with another organism is that the humans alveoli stores carbon dioxide and oxygen when they are being switched like air sacs of the tracheal system of grasshopper.


  1. Spiracles: There are ten spiracles. These are the site where air is taken in first.
  2. Air sacs: Store air from tubes.
  3. Atria: Small spaces that the spiracles open to.
  4. Tracheae: fine air tubes that have a wall of single layered epithelial cells.

Crayfish: Integumentary System

The integumentary system of a crayfish is basically the external anatomy with a couple of other structures, and is a hard exoskeleton. The integumentary system benefits a crayfish by providing it with protection, support, shelter, and movement. The integumentary system of a crayfish has 8 jointed walking legs, a segmented body, 2 antennae, and compound eyes.


  1. Walking legs: Help with movement.
  2. Swimmerets: Help with movement in water.
  3. Antennae: Help with sensing.
  4. Compound eye: Help with vision.
  5. Chelipeds (pincers): Help catch prey and protect itself from predators.
Crayfish dissection-- External Anatomy

Taxonomy (Cladogram)


Grasshopper/Crayfish Interesting Information!


  • Can leap up to 20x it's length with it's hind legs
  • They make their sound by rubbing their legs together
  • Over 18,000 different species
  • Grasshoppers live for about one year
  • No eyes
  • No ears
  • Tympanal organ, helps to hear
  • In Japan, grasshoppers are seen as good luck
  • Grasshoppers have a small cuticle on their knee that helps with catapulting into the air


  • Females store sperm until ready to fertilize eggs
  • Exoskeletons don't grow with them
  • Water and land creatures
  • Aren't born red
  • Over 500 crayfish species
  • Normally 3-4 inches long
  • Freshwater creatures
  • Contain inner gills that allow them to live out of water!
  • Eggs develop while attached to the swimmerettes of females
  • Crayfish feed at night

Links with more information:

Grasshopper Dissection