Arthropod lab



In this lab you will look at two preserved arthropods; one is a grasshopper while the other is a crayfish. Crayfish belong to the class Crustacea while grasshoppers belong to the class insecta. The class insecta has more animals than the class crustacea.


In this lab you will; examine two preserved arthropods (grasshopper and crayfish). Look for similarities that may be phylum traits, and look for differences in these animals that may be specific class traits.

Some facts about arthropods

Lab in action

Arthropod examination

This lab does not require any tools or equipment since you will only be observing the arthropods. Look at the arthropods. Do you see the difference? One is a grasshopper and one is a crayfish, examine them carefully and then determine what features are unique to one and so forth, then put your findings on a table to record your data. Once your done make sure to leave the lab area clean for the other people who might want to observe the arthropods.

Grasshoper anatomy

Antennae: Sensory organs of touch

Labrum: Broad upper lip

Labium: Lower lip

Mandible: sideways jaw that crushes food

Femur, tibia, tarsus: 3 parts of the leg

claws: At the end of the tarsus

spiracles: small openings in the abdomen that allow the grasshopper to breathe

Ovipositor: part of the female used for laying eggs

Head, thorax, abdomen: three body regions

wings: used for movement or short burst of flight

Hindwing: back wing

Tibia: connects femur to tarsal segments

coxa: connects femur to upper body

Crayfish anatomy

Cephalothorax: The head and thorax

Abdomen: one of the two body section of a crayfish

Cheleped: claw used to capture food and provide defense

carapace: Outer covering of crayfish

telson: flat triangular section at the tail, used for swimming

Uropod: anterior flipper that propels it through the water

swimmerets: Organs that create water currents and function in reproduction

walking legs: enable the crayfish to walk slowly

antennae: an antenna like appendage with receptors for touch

antenna: an appendage specialized for touch and taste

rostrum: part of the carapace that protects the eyes

feeding appendage: hole where food goes into mouth