All About Arthropods!
By Leighanne Masri
Vu - PAP Bio - Per.4
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
- 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:
- Fertilize it's surroundings with it's droppings (frass)
- Return nutrients to soil
- Serve as food
- Swarm and feed off crops
Grasshopper Anatomy Part 1
Grasshopper Anatomy Part 2
Crayfish: Background Information/ Ecology
- Fresh water habitats
- 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:
- Omnivoric scavenger
- Eat aquatic organisms
- 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.
- Spiracles: There are ten spiracles. These are the site where air is taken in first.
- Air sacs: Store air from tubes.
- Atria: Small spaces that the spiracles open to.
- 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.
- Walking legs: Help with movement.
- Swimmerets: Help with movement in water.
- Antennae: Help with sensing.
- Compound eye: Help with vision.
- Chelipeds (pincers): Help catch prey and protect itself from predators.
Crayfish dissection-- External Anatomy
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: