Predation of sporocysts of Fasciola gigantica by rediae
of Echinostoma audyi.
In 1999, San Solomon Springs had the greatest percentage of snails containing rediae
and cercariae (26.
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.