nephridium

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Related to nephridia: Malpighian tubules, parapodia

ne·phrid·i·um

, pl.

ne·phrid·i·a

(ne-frid'ē-ŭm, -ă),
One of the paired, segmentally arranged excretory tubules of invertebrates such as the annelids.
[G. nephros, kidney, + Mod. L. -idium, dim. suffix, fr. G. -idion]

nephridium

(nə-frĭd′ē-əm)
n. pl. nephrid·ia (-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.

ne·phrid′i·al adj.

nephridium

(pl. nephridia) a primitive excretory organ present in many invertebrates (e.g. the earthworm) in the form of a tube which opens at one end to the exterior. The other end may open into the COELOM or may terminate in a FLAME CELL.

nephridium

pl. nephridia [L.]
1. either of the paired excretory organs in each body segment of certain invertebrates, having the inner end of the tubule opening into the coelomic cavity.
2. various excretory structures such as the nephron of the embryo.
References in periodicals archive ?
One or two pairs of anterior nephridia, in 6/7-8/9, with compact spindle-shaped postseptale (up to 90 [micro]m x 40 [micro]m) tapering into short (35 [micro]m) ectal duct in its posterior end.
The attached figures clearly showed two pairs of nephridia, the gizzard in segment 6, and holandry as the generic characters for Brachydrilus, although a pair of spermathecae in 12/13 was evaluated as being in an 'abnormal position'.
Oblique transverse sections, approximately 5 mm thick and including mantle, gills, gonad, digestive gland, nephridia, and foot were taken from each specimen.
These cells appear to be the larval mesoderm, which we suspect will form larval muscles such as the dorsal levators, and possibly the larval nephridia.
Nephridia, in posterior segments two pairs per segment, coiled; the dorsal pair larger and the ventral smaller, this varying between segments, in some the dorsal smaller and the ventral larger.
Remacha-Trivino (2002) found a parallel disorganization and subsequent reorganization of nephridia and gonads in S.
Based on nephridia characteristics, Korniushin (1998) suggested that all African Sphaerium spp.
Tissue samples were embedded in Paraplast, and oblique transverse sections, approximately 5-mm thick, were taken from each specimen including mantle, gills, gonad, digestive gland, nephridia and foot.
Females with single pair of ciliated ducts (oviducts, nephridia, or both) opening on ventral surface of segment 11, with external opening only 10 [micro]m in diameter (Fig.
They mature to metaphase of meiosis I in the coelomic fluid, are collected by the nephridia, and spawned (Daly, 1972).
Antidiuretic and diuretic activities of FMRFamide and GDPFLRFamide respectively have been demonstrated in nephridia of a leech (Salzet et al.