nephridium
tubular excretory organ of lower animals such as earthworms
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
nephridium pl. nephridia
[Gk. nephros, kidney]
A tubular excretory structure found in many invertebrates.
nephron ...
nephridium The excretory organ in þatworms and other invertebrates; a blind-ended tubule that expels waste through an excretory pore.
nephridium One of the segmentally arranged, paired excretory tubules of many invertebrates, notably the annelids.
Many invertebrates such as flatworms use a nephridium as their excretory organ. At the end of each blind tubule of the nephridium is a ciliated flame cell. As fluid passes down the tubule, solutes are reabsorbed and returned to the body fluids.
Nervous System (with brain).
Excretory System (nephridium or nephridia).
Circulatory System (open circulatory system - except cephalopods which are closed).
Respiratory System (gills or lungs).
 See also: Organ, Animals, Animal, Tissue, Membrane
  
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