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Arthropods (phylum Arthropoda) (from Greek ἀρθρον, meaning joint and πούς/ποδός, meaning foot) are the largest phylum of animals and include the insects, arachnids, crustaceans, and others. Approximately eighty percent of extant animal species are arthropods, with over a million modern species described and a fossil record reaching back to the early Cambrian. Arthropods are common throughout marine, freshwater, terrestrial, and even aerial environments, as well as including various symbiotic and parasitic forms. They range in size from microscopic plankton (~0.25 mm) up to forms several metres long.

Arthropods are characterised by the possession of a segmented body with appendages on each segment. They have a dorsal heart and a ventral nervous system. All arthropods are covered by a hard exoskeleton that is made out of chitin, a polysaccharide. Periodically, an arthropod sheds this covering when it moults. This covering makes arthropods less prone to dehydration.

Basic arthropod structure


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RT @duncraft: Nuthatches,chickadees and warblers help keep our pine forests healthy, eating harmful arthropods and spurring... http://bi ...
lazylibrarian (kiirstin) Thu, 10 Dec 2009 14:23:32 -0000
RT @duncraft: Nuthatches,chickadees and warblers help keep our pine forests healthy, eating harmful arthropods and spurring... http://bi ...
@stephenemoss pretty sure hydra has no planar cell polarity (although it does have PCP genes), simplest I can think of are arthropods
gimpyblog (gimpy) Thu, 10 Dec 2009 13:08:50 -0000
@stephenemoss pretty sure hydra has no planar cell polarity (although it does have PCP genes), simplest I can think of are arthropods
http://www.care-sheet.com/index/Arthropods Arthropods
WikiPetsBot (WikiPetsBot) Thu, 10 Dec 2009 12:24:44 -0000
http://www.care-sheet.com/index/Arthropods Arthropods
OTS Resources and Databases - Arthropods of La Selva Project (ALAS) http://www.ots.ac.cr/alas #Arthropods
OTS_OET (OTS) Thu, 10 Dec 2009 12:14:57 -0000
OTS Resources and Databases - Arthropods of La Selva Project (ALAS) http://www.ots.ac.cr/alas #Arthropods
Q: "What is a worm considered, if its not considered an insect or a mammal?" A: "It's a protostome - same class as arthropods and mollusks."
askus247 (Ask Us 24/7) Wed, 09 Dec 2009 20:50:34 -0000
Q: "What is a worm considered, if its not considered an insect or a mammal?" A: "It's a protostome - same class as arthropods and mollusks."
Reading up on Arthropods might give me nightmares. http://en.wikipedia.org/wiki/arthropod I also want to now see wild as many as possible.
LukeInProgress (Luke Tokaryk) Wed, 09 Dec 2009 16:54:29 -0000
Reading up on Arthropods might give me nightmares. http://en.wikipedia.org/wiki/arthropod I also want to now see wild as many as possible.

 
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