Metanephridia
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Metanephridia
excretory organs in invertebrates (mainly annelids), paired metameric tubules of ectodermal origin that open at one end through a ciliated funnel into the coelomic sacs (the secondary body cavity) and at the other end to the exterior. Metanephridia developed evolutionarily from protonephridia.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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