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Are Spiders Insects?

are-spiders-insects

ANSWER:

Spiders are NOT insects.

More Info: Spiders belong to a special class of organisms known as Arachnida.  Like insects, Arachnidas belong to the phylum Arthropoda, which also include ticks, scorpions, centipedes, and other similar organisms. (“Introduction to the Arthropoda”, ucmp.berkeley.edu )

Similarities between Insects and Spiders

Belonging to the phylum Arthropoda, insects and spiders share similarities, which include:

  • Segmented body.
  • Paired segmented appendages.
  • Bilateral symmetry.
  • Chitnous exoskeleton.
  • Tubular alimentary canal with mouth and anus.
  • Open circulatory system, a tubular dorsal blood vessel.
  • Body cavity or coelom.
  • Nervous system of anterior ganglia and paired nerve cords.
  • Striated muscles in skeletal system.
  • Respiration by gills, tracheae, or spiracle.

 

“Phylum Arthropoda.” Department of Entymology . University of Minnesota, n.d. Web. 5 Mar. 2012. <www.entomology.umn.edu/cues/4015/handouts/ Orders.htm>

Arachnida Classification

In addition to the characteristics that place spiders in the phylum Arthropoda, Arachnidas possess book lungs–so named because they look like the pages of a book, a cephalothorax (head attached to thorax) and abdomen, and fangs with venom glands or chelicerae–the first pair of fang-like appendages near the mouth. (“Systematics of the Arachnida.”, ucmp.berkeley.edu)

 

Resources

[1] “Introduction to the Arthropoda.” UCMP – University of California Museum of Paleontology. N.p., n.d. Web. 5 Mar. 2012. http://www.ucmp.berkeley.edu/arthropoda/arthropoda.htm

[2] “Systematics of the Arachnida.” UCMP – University of California Museum of Paleontology. N.p., n.d. Web. 5 Mar. 2012. <http://www.ucmp.berkeley.edu/arthropoda/ arachnidasy.html>

[3] “Phylum Arthropoda.” Department of Entymology . University of Minnesota, n.d. Web. 5 Mar. 2012. <www.entomology.umn.edu/cues/4015/handouts/ Orders.htm>

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