Blue is the cephalothorax; black is the pedicel; pink is the abdomen.
Blue is the cephalothorax; black is the pedicel; pink is the abdomen.
 
 
A sack of spiderettes
A sack of spiderettes
 
 
Close-up of spider's eyes and pedipalps
Close-up of spider's eyes and pedipalps
 
 
The fangs of a spider
The fangs of a spider
 
 
A Goliath Birdeater is one of the largest spiders.
A Goliath Birdeater is one of the largest spiders.
 
 
The underside of a spider
The underside of a spider
 
 
The spider uses its spinneret to make a web.
The spider uses its spinneret to make a web.
 
 What is...spider?
Topic(s):   Invertebrates, Spiders, What is ...

Spiders are invertebrates. That means they do not have backbones. They have exoskeletons. The exoskeleton is a hard covering on the outside of the body. Spiders are also arachnids. That means they have eight legs. They have no wings or antennae.

Spider bodies have two sections. The front one is called the cephalothorax. The back section is the abdomen. These are connected by a tiny tube called the pedicel. This tube is flexible. It allows the back of the spider to move without moving the front.

A spiderís eight legs are attached to the front section. Most, but not all, spiders have eight eyes.

The spiderís mouth is in the front. Instead of jaws, it has two little legs behind its mouth. These are called pedipalps. The pedipalps are used to hold on to prey. A spider also has two even smaller legs in front of its mouth. Each one has a fang. Most spiders use fangs to inject venom into prey. The venom stuns or kills the prey. It also dissolves the prey. Then the spider can drink its food. Almost all spiders have venom. Most spider venom does not hurt humans.

Spiders have spinnerets on their abdomens. These are used to spin silk. Not all spiders spin webs, but they all use silk for something.

One kind of tarantula is as big as a dinner plate. The mygalomorph spider is as small as a pinhead. There are about 40,000 spider species.

Resource information

Encyclopedia Britannica. (n.d.). Spider (arachnid). Retrieved April 23, 2013, from http://www.britannica.com/EBchecked/topic/559817/spider/47801/Form-and-function?anchor=ref494938

Nieuwenhuys, E. (2008, September 2). Spider info. Retrieved from http://ednieuw.home.xs4all.nl/Spiders/Info/spiderinfo.htm

Spider Facts - Spiders are Arachnids. (n.d.). Retrieved April 23, 2013, from http://www.kidzone.ws/lw/spiders/facts01.htm

Walker, C. (2004, June 23). Spider Sense: Fast Facts on Extreme Arachnids. Retrieved from http://news.nationalgeographic.com/news/2004/06/0623_040623_spiderfacts.html

Citation information

APA Style:† † † † What is a Spider?. (2014, March). Retrieved from Facts4Me at http://www.facts4me.com

MLA Style: † † † "What is a Spider?." Facts4Me. Mar. 2014. http://www.facts4me.com.

Back To Previous          Back To Top

Copyright © 2006 - 2018, Facts4Me. All rights reserved.