all about arthropods

Arthropod Lab - PAP Biology 4th period Guzman

objectives

The reader will learn about the external anatomy of an arthropod, focusing on the integumentary system. The reader will also learn about the habitat of an arthropod, its predator and prey, its life cycle, its evolution, and its role in out ecosystem.

Background information and anatomy

The crayfish, or the Cambarus robustus (class crustacea) and the grasshopper, or the Melanoplus differentialis (class insecta), are two examples of arthropods. Organisms in the phylum arthropoda have segmented bodies consisting of a head, a thorax, and an abdomen. Arthropods have jointed legs and antennae and have bilateral symmetry. They poses an exoskeleton of chitinous exoskeleton that is shed during growth. The nervous system is dorsal (the underside) and the circulatory system is open and ventral. Insecta characteristics include wings, seperate sexes, 2 antennae, 2 leg pairs. Crustacea traits include a telson, 6 antennae, 5 leg pairs, no wings and chela.

Integumentary system

The skin of the arthropods prevent water loss because of the wax layer and its cuticular composition. It serves as a barrier from parasites, pathogens, and predators, as well as the protections of the organism's internal organs and tissues.

ecological importance

Arthropods are the most diverse group and make up 80 percent of all named species of animals. Those that are predators are useful for gardeners and farmers by eating pests that destroy crops and flowers. Some arthropods play an important role in pollination. Some are even a nutritious food source in certain parts of the world.