Accidentally Arthropoda

Arthropod Dissection PreAp Biology 4-7-14 Panos Kontoyiannis

Phylum Arthropoda

The phylum Arthropoda is the largest of all other phylums. This phylum consists of insects, crustaceans, and many other segmented animals. An arthropod has a segmented body of at least two parts and a hard exoskeleton. In the dissection the crayfish( genus cambarus) and grasshopper (suborder Caelifera) were compared. The grasshopper is a herbivore as it feeds on various plants while the crayfish feed on dead plants and animals. Crayfish live in aquatic environments while grasshoppers are more suited to terrestrial environments. Crayfish are a common dish in the southern United states. Grasshoppers are also eaten as a source of protein in many countries in the Middle East and Latin America.

Today's Objective

Students will observe similarities and differences between two members of the phylum Arthropoda, the crayfish and grasshopper. Additionally, students will observe the integumentary system of these two organisms.

Arthropod Cladogram

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Integumentary System

The integumentary system of Arthropods consists of the exoskeleton which is composed of chitin. The body of Arthropods is segmented and many Arthropods have jointed appendages. Arthropods go through molting because the exoskeleton can't grow. Insects have their bodies separated into 3 parts; the head, thorax and abdomen. Meanwhile crustaceans have their bodies separated into two parts; the cephalothorax and the abdomen. Many crustaceans have chelipeds which help them in grasping objects or prey.
Crayfish Anatomy Part 1
Grasshopper Anatomy Part 1