Creepy Crawlers

by: Hannah Katz teacher: Ms. Vu

The Arthropod

Arthropods are invertebrate animals with exoskeleton segmented body and joined appendages. Arthropods include insects, arachnids, and crustaceans. Their bodies are characterized by joined limbs and cuticles. There are many types of arthropods such as crabs, spiders, and grasshoppers. The scientific name is for arthropods is Arthropoda.

Arthropods have been on earth since about 428 million years ago. They are among the oldest known animals to have lived on land, and they comprise over 90% of the animal kingdom. All arthropods have a thick exoskeleton, which protects the body and retains water. The arthropods' exoskeleton is made of a compound known as chitin, which is present in the form or plates with joints in between.

The Respiratory System

An arthropod's respiratory system usually depends much on their environment and the subphylum to which they belong. Arthropods have two main parts which are tracheae and book lungs as respiratory organs. They have tiny tubes that permit passage of gases into the interior of the body. Arthropods inhales through small holes on the sides of their bodies, known as spiracles. The air finds its way into the windpipe or trachea, where oxygen is absorbed into blood.