| Share
 

Arthropoda

Subphylum Chelicerata

Chelicerates are characterized by the absence of antennae and jaws and the presence of feeding structures (chelicera), which are modified pincerlike appendages used mainly for grasping and fragmenting food. They include spiders, scorpions, and other arachnids (class Arachnida), horseshoe crabs (class Xiphosura), and the sea spiders (class Pycnogonida) as well as the extinct giant sea scorpions (class Eurypterida). The arachnids are largely terrestrial, and the other classes marine.

Sections in this article:

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

See more Encyclopedia articles on: Zoology: Invertebrates

24 X 7

Private Tutor

Click Here for Details
24 x 7 Tutor Availability
Unlimited Online Tutoring
1-on-1 Tutoring