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The nephridium (pl.: nephridia) is an invertebrate organ, found in pairs and performing a function similar to the vertebrate kidneys (which originated from the chordate nephridia). Nephridia remove metabolic wastes from an animal's body.
Nephridium, unit of the excretory system in many primitive invertebrates and also in the amphioxus; it expels wastes from the body cavity to the (usually aquatic) exterior. The evolution of nephridia encouraged tissue specialization by eliminating the need for all cells of an organism to be in.
Nephridia and malpighian tubules are excretory systems of worms and insects, respectively. Explore the differences between nephridia and malpighian tubules in the table below.
Definition of Nephridium: An excretory tubule which opens to the exterior through the nephridiopore and the inner end of the tubule is blind (associated with terminal cells or solenocytes) in the protonephridium or opens in the coelom through the ciliated funnel or called nephrostome in metanephridium.
Nephridia of Worms. Earthworms (annelids) and some other invertebrates, such as arthropods and mollusks, have slightly-more-evolved excretory structures called nephridia. A pair of nephridia is present on each segment of the earthworm.
The nephridia of annelids, nemertines, flatworms, and rotifers. The word nephridium applies in its strict sense only to the excretory organs of annelids, but it may usefully be extended to include the excretory organs of other phyla having similar characteristics. Annelids are segmented animals that typically contain a pair of nephridia on each ...
Earthworms (annelids) have slightly more evolved excretory structures called nephridia, illustrated in Figure 41.10b. A pair of nephridia is present on each segment of the earthworm. They are similar to flame cells in that they have a tubule with cilia. Excretion occurs through a pore called the nephridiopore. They are more evolved than the ...