Arthropods: Scratching the Suface

Hannah Reeves 4/8/14 Vu-PAP Bio-4

Objective:

To observe the external anatomy of arthropods

Crayfish Facts

Scientific Name: Cambarus robustus

  • Crayfish can be found in almost any body of fresh water. However, crayfish are more common in Northern Virginia.
  • Raccoons, opossums, snakes, and muskrats are predators of crayfish.
  • Crayfish like to eat worms, insects, insect larvae, and the eggs of fish, frogs, toads, and salamanders.
  • Crayfish are the "clean out the refrigerator" type. They are omnivores and scavengers giving their diet a large variety.
  • Crayfish have eyes on stems so they can see all around them just by moving the stems.
  • Crayfish antennae are sensitive enough to detect nearby movement and chemicals in the water.

Grasshopper Respiratory System

General: The respiratory and circulatory systems are not connected. This system is made up of air-filled tubules called tracheae.

Spiracles: These are small holes through which the tracheae open to the outside. There are 4 spiracles found in the thorax and 16 are in the abdomen.

Tracheoles: These are the extreme ends of tracheal tubes that branch out becoming finer and finer. A tracheole is very close to any cell of the body.

Abdomen Muscles: These muscles compress the internal organs forcing air out of the tracheae.

Liquid seals: These force the air to flow in one direction by pushing it from the thorax to the abdomen.

The respiratory system works with the muscular system because the muscular system forces air out and allows air back in.

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Arthropod Evolution (click)

Click the next and previous arrows for more information

Grasshopper Anatomy Part 1
Crayfish Anatomy Part 1