The internal anatomy of a typical female two-lunged spider. The yellow items signify portions of the digestive system, red indicates the circulatory system, blue is the nervous system, pink is the respiratory system, and purple is the reproductive system. Lastly, the spinnerets and poison glands are shown in green.Image: Ryan Wilson, after John Henry Comstock
 | This picture of the day has been featured on Portal:Arthropods. |