Arthropod Lab By:Mariam Moini, Mitcham P2
Background Information of Crayfish
Astacoidea is the scientific name of crayfish.
- Kingdom: Animalia
- Phylum: Arthropoda
- Subphylum: Crustacea
- Class: Malacostraca
- Order: Decapoda
Crayfish are omnivorous. Crayfish eat fish, shrimp, water plants, worms, insects, snails, plankton, and more. They are scavengers and will eat dead things, as long as they are relatively fresh.Crayfish are consumed by animals such as raccoons,opossums,muskrats, and snakes.
There are over three hundred kinds of crayfish present in North America. Each crayfish lives in a specific habitat, but considering the large amount of species, they can be found in most aquatic and semi-aquatic environments throughout Canada and the United States.Crayfish can be found in about any body of water that isn't over polluted.
- Crayfish will create a home for themselves under a rock or a bank by moving smaller items around. They are aggressive and defend their territories.
- Crayfish are Crustaceans, and are closely related to lobsters, crabs, and shrimp
- They have ten legs; the front two have developed large claws called "Chellae."
- There is a species that is blue. It is called a Blue Crayfish. There are also red and white crayfish.
- The red crayfish is the most common, the blue is the second most common, and the white crayfish is the least common.
- The most common crayfish gets 3-4 inches long, but they can get much bigger in the wild in deep lakes.
- Adult size is reached by crayfish in the wild in about 4 years. They can live from 20 to 30 years.
- Crayfish have adapted their eyes, pincers, reproduction methods and color over time.
THE RESPIRTORY System of Crayfish
Relationship to Humans
Many people eat crayfish. They are also used by fisherman as bait.
Crayfish help humans in other ways, such as cleaning up dead animal and plant matter from the bottom of streams, and by controlling populations of insects and other animals.
Background Information of Grasshoppers
"Caelifera" is the scientific name of grasshoppers.
The prey of a grasshopper are: crops,and plants.They will eat almost any type of leaves, but they prefer soft vegetation. The predators of a grasshopper are: rodents, especially mice, Insects like the mantis, spiders, birds like seagulls and reptiles. Frogs also eat grasshoppers.
The northern grasshopper has a wide variety of habitats,mainly in regions of North America, including mountain meadows, bogs and swamps, and arctic tundra.
- They have no ears, but they do hear with an organ called tympanum.
- When grasshoppers are picked up, they “spit” a brown liquid commonly called “tobacco juice.” Scientists believe this liquid may protect them from attacks by predators.
- Males sing, by rubbing their back legs against their wings, to attract females and to warn off other males
RESPIRATORY System of a Grasshopper
Spiracles-small holes where tracheae open to the outside (you can see those as little dots on the abdomen of a grasshopper)
The spiracles are guarded by
- valves controlled by muscles that enables the grasshopper to open and close them;
- Hairs that filter out dust as the air enters the spiracles.
Tracheae- a system of air-filled tubes where oxygen and carbon dioxide are exchanged between tissues
Air Sacs- the area where the oxygen flows to once inside the spiracles, these are temporary storage spaces for air as the oxygen is passed through the body
Grasshoppers Relationship to the Surrounding World
- Grasshoppers benefit ecosystems through their droppings,which contain plant nutrients that enrich the soil and fertilize new plant growth.
- Grasshoppers also serve as food for other insects, birds and small mammals.
- Grasshoppers serve as a high-protein, nutrient-rich source of food for people in parts of Africa, Asia and the Middle East.
- Scientists use grasshoppers to study how various chemicals would impact humans and as test subjects for new drugs.
- ("Grasshopper - Animal Facts." Grasshopper - Animal Facts. N.p., n.d. Web. 07 Apr. 2014.)