Redia

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Related to rediae: oncosphere, Metacercariae, Miracidia

redia

[′rē·dē·ə]
(invertebrate zoology)
A larva produced within the miracidial sporocyst of certain digenetic trematodes which may give rise to daughter rediae or to cercariae.

Redia

 

one of the parthenogenetic generations of the digenetic flukes, or trematodes, which parasitizes an intermediate host (mollusks). The redia develops in the body cavity of the worm’s first parthenogenetic generation, the sporocyst. It in turn produces the cercaria, the larvae of the sexually mature flukes. Unlike the sporocyst, the redia has a mouth opening, a pharynx, an intestine, and a birth pore.

References in periodicals archive ?
Predation of sporocysts of Fasciola gigantica by rediae of Echinostoma audyi.
Inside the snail, the miracidia multiply asexually through a single generation of sporocysts and two generations of rediae to fork-tailed cercariae.
Pleurolophocercous and xiphidio cercariae emerge one at a time from rediae and never tail first.
After a week, snails known to yield cercariae were sacrificed by crushing and the tissues, as well as individual cercariae and rediae, were fixed in 2% glutaraldehyde, buffered in .
Caudate cercariae develop within rediae in the whelks.
We recorded the size of cercariae and rediae in whelks collected from the field in May and August 1994, and from the laboratory sampling in November 1995 and January 1996, from images projected through a drawing tube attached to a Leitz diaplan (x40) microscope using a digitizer and computer (using Sigma-scan image analysis software, version 3.
In addition to larval stages of Centrocestus formosanus, rediae and cercariae of two other trematodes were found in Melanoides tuberculata in Mexico, namely those of Hap lorchis pumilio (Looss, 1896) (Heterophyidae) and Philophthalmus gralli Mathis et Leger, 1910 (Philophthalmidae) (Scholz et at.
One or two generations of rediae may be present in the snail.
tentaculata infection with rediae and cercariae of Sphaeridiotrema sp.