Dissecting Arthropods 101
Jiakai Pan Arthropod Dissection Pre-AP Bio Vu Period 1
Caelifera and Astacoidea
Grasshoppers and crayfish both belong to the kingdom of Animalia, and under the phylum Arthropoda. However, the species differ from here. Grasshoppers are found all over the world, and mostly live on land. However, crayfish live mostly in bodies of fresh water. Crayfish are crustaceans, while grasshoppers are insects. Unlike grasshoppers, who are herbivorous, crayfish are omnivorous, and they will sometimes eat dead animals as well.
Grasshoppers are known to destroy crops, so they are considered pests by many people. They are often very destructive and invasive.
Grasshoppers are known to destroy crops, so they are considered pests by many people. They are often very destructive and invasive.
Today's Objectives
Students will learn how to dissect both a grasshopper and a crayfish, and will be able to analyze the respiratory systems of each organism.
Evolutionary Relationships of the Crayfish
Evolutionary Relationships of the Grasshopper
Note that the grasshopper is part of the class Insecta.
A Grasshopper's Habitat
A grasshopper's habitat can be varied, ranging from a tropical rain forest to a swamp. Generally, grasshoppers live wherever there is a larger concentration of food.
A Grasshopper's Predators
Grasshoppers have many predators, including birds, frogs, lizards, and racoons.
Life Cycle of A Grasshopper
The life cycle of a grasshopper.
A Crayfish's Habitat
Crayfish generally live near bodies of fresh water that are not too polluted. Rivers and brooks are where crayfish are mainly found. They usually create a home by nestling under a rock for protection.
A Crayfish's Predators
Crayfish have many predators, including, but not limited to: fish, birds, alligators, racoons, and opossums.
A Crayfish's Lifecycle
A crayfish's life cycle.
How to Dissect a Grasshopper
Grasshopper Dissection
How to Dissect a Crayfish
Crayfish dissection-- Internal Anatomy
The Respiratory System of a Grasshopper
Tracheal Tubes: Tubes that branch and extend throughout the body. Grasshoppers use these to breathe.
Spiracles: Air leaves and enters the tracheal tubes through this structure.
Book lungs: Organs that have layers of respiratory tissue stacked like the pages of a book.
Spiracles: Air leaves and enters the tracheal tubes through this structure.
Book lungs: Organs that have layers of respiratory tissue stacked like the pages of a book.
The Respiratory System of a Crayfish
Crayfish breathe through gills that are attached to their walking legs. The movement of walking helps circulate water over these gills.
The Respiratory Systems At A Glance
The respiratory system of a grasshopper compared to the respiratory system of a crayfish is quite different. For example, the grasshopper uses a tracheal system, in which the organism breathes through tracheal tubes. However, the crayfish breathes through its gills, which are attached to its walking legs. The function of both respiratory systems is to obtain oxygen, which is essential to the body.
Works Cited
http://crescentok.com/staff/jaskew/isr/biology/biolab46b.htm
http://www.tutorvista.com/content/biology/biology-ii/respiration/grasshopper-gaseous-exchange.php#
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tracheal_Breathing.html
http://crayfishfacts.org/
http://a-z-animals.com/animals/grasshopper/
http://www.fcps.edu/islandcreekes/ecology/crayfish_%28cambarus%29.htm
http://www.fcps.edu/islandcreekes/ecology/differential_grasshopper.htm
http://comparativeanatomybiology.weebly.com/grasshopper-anatomy.html
http://www.tutorvista.com/content/biology/biology-ii/respiration/grasshopper-gaseous-exchange.php#
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tracheal_Breathing.html
http://crayfishfacts.org/
http://a-z-animals.com/animals/grasshopper/
http://www.fcps.edu/islandcreekes/ecology/crayfish_%28cambarus%29.htm
http://www.fcps.edu/islandcreekes/ecology/differential_grasshopper.htm
http://comparativeanatomybiology.weebly.com/grasshopper-anatomy.html