Arthropod Alert!

Arthropod Lab-PAP Bio-Ms.Vu

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Arthropods constitute over 90% of the animal kingdom and are classified in the phylum Arthropoda. They are distinguished from other animals by having an exoskeleton, jointed legs and appendages, and bilateral symmetry.


Students will examine two arthropods (grasshopper and crayfish) and look for similarities that may be a phylum trait. Also look for differences in the two animals that may be class traits.

Crayfish Dissection!

Crayfish Dissection

External Anatomy

Theres invertebrate animals have exoskeletons consisting of a segmented body and jointed appendages. These appendages are mostly made of chitin. Since an exoskeleton cannot stretch, arthropods must replace their exoskeleton by moulting when they grow. The main purpose of an exoskeleton is to protect to animals soft insides.