Arthropod lab

By: Kristophe Zephyrin Mitcham P2

Objectives

Look for similarities and differences between crayfish and grasshoppers.
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Background info (Crayfish)

  • genus/species Orconectes virilis
  • Crayfish usualy live in freshwater
  • predators include; Fish, raccoon, otters, and herons
  • prey include insects and snails
  • also eat plants and algae
  • northern species use tail flip to escape enemies
  • scavenger

interesting facts about crayfish

  • There are blue red and white crayfish
  • Hydrogeologists- study crayfish
  • 350 of the 500 species of crayfish live in the U.S.

Circulatory system of a crayfish

Crayfish have open circulatory systems. the organs include

  • Heart- pumps blood
  • Abdominal aorta- blood goes towards posterior
  • anterior dorsal aorta- blood goes towards anterior
  • sinuses- act as veins

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human influence on crayfish

  • Human eat a lot of crayfish
  • Louisiana red crayfish were introduced to east Africa.
  • the introduction of this species of crayfish has spread disease in the region.
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Background info ( Grasshopper)

  • genus/species Stethophyma celota
  • live in temporate and tropical environments
  • primary consumer
  • hatch from eggs
  • eaten by many, such as; skunks, shrews, birds, toads, and many more.
  • Eat seeds and leaves

Interesting facts about Grasshoppers

  • Grasshoppers can jump 20 times their height.
  • Grasshoppers are a good source of protein (Yum!)
  • tympanas allow grasshoppers to hear.
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Respiratory system of a grasshopper

Air is taken in through spiracles. then it is taken to the Tracheae, where respiration occurs.

  • Air sacs- hold air
  • spiracles- take in air
  • Tracheae- air filled tubes that diffuse gasses

human Influence on grasshoppers

  • Grasshoppers cause more than 80 million dollars of damage to crops
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