Crayfish and grasshopper Dissection April 9, 2014

Objective of the day!

Students will learn the external and internal systems of the crayfish and grasshopper. Student will point out organs and their job in the respiratory system.

Did you know...?

Crayfish: Their scientific name is Orconectus rustics crayfish can be found in fresh water that isn't over polluted for example, rivers, lakes, and ponds. Crayfsih are nocturnal so they hunt for food mostly at night.

Grasshoppers: Their scientific name is Melanoplus Differentialis. Many species of grasshoppers are herbivores os they eat grasses. Grasshoppers can be found around spring or summer.

Respiratory System: A closer look!

Aquatic arthropods need gills for respiration. the gills are always outgrowths of the skin and are covered by the exoskeleton, which is thin in this area and not a barrier to gases that are exchangeable. Terrestrial arthropods have a trachea and lungs as respiratory organs. Tracheae are tiny tubes that allow gases into the inside of the body of the animal. Arthropods also have spiracle that help reduce water loss.

Taxonomy Classification of the Crayfish

Kingdom: Animalia

Phylum: Arthropoda

Subphylum: Crustacea

Class: Malacostraca

Order: Decapoda

Suborder: Pieocyemata

Taxonomy Classification of the grasshopper

Kingdom: Animalia

Phylum: Arthropoda

Subphylum: Hexapoda

Class: Insecta

Order: orthroptera

suborder: Caelifera


The grasshopper has many predators including, birds, lizards, mantids, spiders, and rodents. Their mating behavior is different from other animals especially how male courts female. Females dig holes to leg eggs. Some grasshoppers spit a brown liquid as a defensive behavior in response to being handled. Crayfish are both predator and prey because they both seat animals and are eaten by other animals.

Impacting the ecosystem!

The grasshopper can either impact our environment in a positive or negative way. they impact it in a positive way because since they're herbivore they link plants to the rest of the ecosystem. Dropping help by nutrient turnover, by returning nutrients as fertilizer for the plants. This provides food for birds, but also other arthropods. They can also affect our environment in a negative way by causing crop damage and loss of plants in pastures.