How can we help?

You can also find more resources in our Help Center.

24.3 Arachnids

Vocabulary Chapter 24 - A Closer Look at Arthropods Biology - 2010 Edition Holt McDougal
STUDY
PLAY
chelicerate
arthropod that lacks antennae and has four pair of walking legs & a pair of fanglike mouth parts
arachnid
terrestrial chelicerate, such as a spider
book lung
respiratory organ that has several membranes that are arranged like the pages in a book
spiracle
hole on the body of an insect's exoskeleton through which air can be taken in or released
trachea (plural: tracheae)
a system of thin branching tubes in the bodies of insects that allow for breathing