nephridium

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Related to nephridia: Malpighian tubules, parapodia

ne·phrid·i·um

 (nə-frĭd′ē-əm)
n. pl. ne·phrid·i·a (-ē-ə)
1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms.
2. The excretory organ of a vertebrate embryo from which the kidney develops.

[nephr(o)- + Latin -idium, diminutive suff. (from Greek -idion).]

ne·phrid′i·al adj.

nephridium

(nɪˈfrɪdɪəm)
n, pl -ia (-ɪə)
(Zoology) a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior
[C19: New Latin: little kidney]
neˈphridial adj

ne•phrid•i•um

(nəˈfrɪd i əm)

n., pl. -phrid•i•a (-ˈfrɪd i ə)
an excretory tubule in annelids, mollusks, and other invertebrates that discharges wastes from the body cavity through a pore on the body surface.
[1875–80; < Greek nephr(ós) kidney]
ne•phrid′i•al, adj.
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References in periodicals archive ?
Oblique, transverse, 5-mm-thick sections, containing gills, digestive gland, mantle, nephridia, gonad, and foot were taken from each clam.
We will describe the morphological and molecular development of mesoderm in these species, and the differentiation of two important mesodermal cell types: nephridia and blood.
Oblique transverse sections, approximately 5 mm thick, including mantle, gills, gonad, digestive gland, nephridia and foot were taken from each specimen.
1-3 pairs of anteclitellar nephridia observed in 7/8-9/10 (or none, in some individuals); postclitellar ones beginning in 13/14 or 14/15; compact postseptale of variable shape and with short duct arising posteriorly.
The gut was then freed from surrounding blood vessels and nephridia with a flamed forceps and separated into three sections: foregut, mid gut and hindgut.
An unexpected and surprising result was the finding of coccidia in the gills of Ensis macha, because these Apicomplexan protozoa are usually located in nephridia or digestive glands in mollusks.
Micro-PIXE studies of Cd distribution in the nephridia of the earthworm Eisenia fetida (Oligochaeta).
In particular, Acidovorax-like symbionts of earthworms colonize the nephridia (excretory organs) and degrade peptides and amino acids, facilitating the reabsorption of nitrogen by the worms before it is excreted as waste (Schramm a al.
Benham (1888: 72) reported on a specimen from an unknown type locality, with two pairs of nephridia per segment and the gizzard in segment 6, and named it Brachydrilus [sp.