The Outer Beauty of Arthropods

Emily Clements-Mitcham-PAP Bio-Period 2


This poster is meant to educate people on not only the integumentary system of various arthropods, but the background of them as well. It has general knowledge, such as the predators and prey, and various fun facts. It even includes some other types of media, which hopefully make this virtual poster even more interesting.

General Knowledge


Crayfish are found almost exclusively in freshwater, although they are found in North America, Europe, New Zealand, and East Asia. Their eyes are on stalks, an adaptation allowing for more range of sight. They mostly eat algae, snails, tadpoles, worms, insect larvae, and even sometimes dead fish or salmon eggs. This makes them omnivorous, and at least secondary consumers. Their main predators are raccoons, opossums, muskrats, and snakes.


Grasshoppers are primary consumers, or herbivores, usually consuming grasses and other, similar plants. This means that they are prey to many animals, and predators to none. Many birds, lizards, rodents, and spiders eat grasshoppers. They live in plains or flat areas similar to plains with many (usually tall) grasses and plants. Their powerful and long hind legs allow them to jump from blade of grass to blade of grass quickly to avoid predators. Another adaptation is some grasshoppers' ability to spew a brown, bitter liquid when they are being threatened.

Integumentary System

The integumentary system is essentially the external anatomy. It include the different sections (the 4 pairs of walking legs, the 4 pairs of swimmerets, which are used by females to hold their eggs, and the first leg, or claw, in the crayfish, and the 3 pairs of walking legs in the grasshopper). It also includes the parts of the body, or the abdomen, thorax, and head. Antennae, which act as receptors/feelers for what is in front of the animal, and other sensory organs (i.e. nerves, which are not seen in the picture below) are and important part of this system, and show how this system interacts with the nervous system. Impulses are sent through neurons whenever anything is touched (because there are nerve endings all throughout the skin, or in this case, surface, of an organism). These cause the animal to react, usually by moving in some way.

The above pictures show where each part of the integumentary system is and what they look like.

Taxonomy of Phylum Arthropoda

Crayfish (or Cambarus robustus)

Kingdom: Animalia

Phylum: Anthropoda

Class: Malacostraca

Order: Decapoda

Family: Astacoidea

Genus: Cambarus

Species: C. robustus

Grasshopper (or Melanoplus differentialis)

Kingdom: Animalia

Phylum: Antropoda

Class: Insecta

Order: Orthoptera

Family: Acrididae

Genus: Melanoplus

Species: M. differentialis

Cladogram of Arthropods

This shows the evolutionary relationships between the different organisms in Phylum Arthropoda.

Human Interaction

In general, the interactions between these animals and humans are negative (for the animal that is, not the human).


Crayfish are a common food for many people, especially people who live near swampy areas, considering that is where crayfish are usually found. This obviously lowers the population, like with the perch, but, again, like the perch, it isn't enough to make a dent in the population.


Grasshoppers usually don't directly interact with humans. They way they are affected is mostly by pesticides on crops. Grasshoppers may land on or try to eat said crops and get sick, die, or make the animal that eats them get sick or die.

Fun Facts!

  • Crayfish only live for about 2 years, so they go through stages of life rapidly
  • There are about 500 known species of crayfish, and over half of those live in North America
  • Crayfish can be brown/red, red, blue, and white

  • Grasshoppers can jump up to 20 times the length of their bodies
  • They have 5 eyes, but have no ears
  • There are over 18,000 known species of grasshopper
  • They can make "music" with their hind legs/wings

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