How Do I Pronounce 'Crayfish?!'

Arthropod Lab

Arthropods: Grasshoppers and Crayfish

Although both grasshoppers and crayfish belong to the phylum Anthropoda, they do not belong to the same classes. Grasshoppers are under the class Insecta and crayfish are under the class Crustacea. This difference in classes is seen in several different characteristics. For instance, grasshoppers have three pairs of legs but crayfish have five pairs; grasshoppers have wings but crayfish don't; grasshoppers don't have telsons but crayfish do; grasshoppers have a type of respiratory organ present but crayfish don't; and they have different excretory organs.

Grasshoppers are found widespread across the U.S. and feed on a variety of plants, although some only prefer grasses. Predators of the grasshopper include birds, lizards, mantids, spiders, and rodents.

Crayfish are nearly always found in freshwater, although some can survive in saltwater. They are omnivorous and so will eat almost anything from shrimp to fish eggs to plant material. The natural predators of the crayfish are cod, turtles, otters, and grackles.

Crayfish in the News!

An External Study of Grasshoppers and Crayfish

The Respiratory System of Arthropods

How does it work?

Aquatic arthropods such as crayfish and other crustaceans possess gills in order to breath. Gills are covered by the exoskeleton of these arthropods, but the exoskeleton is thin in the gills area and thus not a barricade to the exchanges of gases during respiration.

Terrestrial arthropods such as grasshoppers and other insects possess tracheae and lungs as respiratory organs. The tracheae are a system of very small tubes that allow the passages of gases into the inside of the body (specifically to different tissues). Tracheal systems are very efficient for the terrestrial arthropods. The spiracles (small openings on the external part of an arthropod) reduce water loss and lets air enter through.

Learn more about Arthropods!