Detail of a sporocyst
in development near the intestine (i) region, showing intense hemocyte infiltration, forming a granuloma-like structure surrounding the larvae (40x).
Once within the snail, successful miracidia transform into a sporocyst
, a sac-like structure that generates genetically identical cercariae (another small, swimming larvae--see Figure 1), which emerge periodically from infected snails to seek out the next host in the parasite's life cycle.
However, the tick Aponomma latum was found infecting some snakes, and a gamont and suspected sporocyst
was observed in a slide preparation from one of these ectoparasites (but no developmental stages in the hemocoel) (Figure 1e).
The miracidium, upon release from the egg, will infect a susceptible snail host and internally will continue to develop into sporocyst
form, transforming into the redia where a mass of cercarial stages is enclosed.
In the snail, the parasite then undergoes asexual replication through sporocyst
stages during 4 to 6 weeks before shedding thousands of infectious cercariae into the water.
In general, the development of trematodes (sporocyst
or rediae) in the first intermediate host is known to have negative effects, such as the inhibition of functions in the parasitized tissues (Corte 2015), but with very limited host reaction, if any (Lauckner 1983, Galaktionov & Dobrovolskij 2003, Boehs et al.
They also contain a single spherical to subspherical sporocyst
, without a Stieda body.
The Fasciola larval stages sporocyst
, redia, and cercaria are in division phases of F.
Sporulated oocysts contain two ellipsoidal sporocysts
with four sporozoites in each sporocyst
a) Translucent Stieda body (SB) and sporocyst
residuum (SR); b) polar granule (PG) and oocyst wall (OW).
This might be due to the differences in humidity, temperature from place to place (variation in environmental condition), and the weather in Qena Governorate, upper Egypt was dry and hot in general as it supported by that mentioned by Smith and Sherman (1994) who mentioned that hot and humid weather is particularly conducive to sporocyst
development and out breaks of clinical coccidiosis.
and mother sporocyst
, takes place within foot muscles, thereby causing increased empty spaces within muscle fibers after their entry in to the viscera of the snail.