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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
More on [ Arthropod ]
Arthropods :: Invertebrates
Arthropoda :: Zoology
@GreeGreece Placing Cheney within the Arachnida is demeaning to chelicerate arthropods, wouldn't You say?
futuredirected (Samantha Thomas) Fri, 18 Dec 2009 04:00:50 -0000
@GreeGreece Placing Cheney within the Arachnida is demeaning to chelicerate arthropods, wouldn't You say?
@avylee http://www.richard-seaman.com/Arthropods/Indonesia/Highlights/AlasPurwoLeech.jpg Thats what they look like *shivers* yuck!
DCTMx3 (lullaby lynn M.) Fri, 18 Dec 2009 00:41:26 -0000
@avylee http://www.richard-seaman.com/Arthropods/Indonesia/Highlights/AlasPurwoLeech.jpg Thats what they look like *shivers* yuck!
OTS Resources and Databases - Arthropods of La Selva Project (ALAS) http://www.ots.ac.cr/alas #Arthropods
OTS_OET (OTS) Thu, 17 Dec 2009 12:14:56 -0000
OTS Resources and Databases - Arthropods of La Selva Project (ALAS) http://www.ots.ac.cr/alas #Arthropods
Cool RT @calacademy: This year researchers at the Academy discovered 94 new species! Among them are 65 arthropods,... http://bit.ly/4p9yiX
FSSanFrancisco (Four Seasons SanFran) Wed, 16 Dec 2009 00:43:56 -0000
Cool RT @calacademy: This year researchers at the Academy discovered 94 new species! Among them are 65 arthropods,... http://bit.ly/4p9yiX
RT @calacademy: This year researchers at the Academy discovered 94 new species! Among the new species described are 65 arthropods,... ht ...
deyoungmuseum (de Young Museum) Wed, 16 Dec 2009 00:18:47 -0000
RT @calacademy: This year researchers at the Academy discovered 94 new species! Among the new species described are 65 arthropods,... ht ...
This year researchers at the Academy discovered 94 new species! Among the new species described are 65 arthropods,... http://bit.ly/4p9yiX
calacademy (CalAcademyofSciences) Wed, 16 Dec 2009 00:14:46 -0000
This year researchers at the Academy discovered 94 new species! Among the new species described are 65 arthropods,... http://bit.ly/4p9yiX
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