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Excretory- Antennal and maxillary gland that have the same basic structure: end sac and convoluted duct which may expand into bladder
Nervous- Dorsal brain with connective nerves passing around anterior end of digestive tract; ventral nerve cord with ganglion in each body segment
Reproduction- Sexually (some are hermaphrodites), most have separate sexes that are distinguished by appendages on abdomen called pleopods (swimmerets); 1st (sometimes 2nd) pleopods are specialized for sperm transfer; they return to sea to release eggs
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"Introduction to the Crustaceamorpha." UMCP . University of Berkely California. 27 Apr. 2008 <http://www.ucmp.berkeley.edu/arthropoda/crustacea/crustaceamorpha.html>.
Myers, Phil. "Subphlyum Crustacea." Animal Diversity Web . University of Michigan Museum of Zoology. 27 Apr. 2008 <http://animaldiversity.ummz.umich.edu/site/accounts/information/Crustacea.html>.