Definitions for echiuroidea
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Webster Dictionary
Echiuroidea(u)
a division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans
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"echiuroidea." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/echiuroidea>.