Terminal growth into the haemocoelic spaces leads to a gradual compression of the acini by the sporocyst
mass that results in partial or, mostly, complete parasitic castration (Lauckner 1983, Valderrama et al.
contains 8 sporozoites and a round or granular residium body.
residuum was a spheroidal or elongate mass of densely packed granules, and the sporozoites contained a conspicuous posterior refractile body.
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.
Byrd described a new species (Table 2) of digene from larval metacercariae developing in a mother sporocyst
found in a tentacle of the terrestrial snail Succinea retusa.
The primary intermediate host is castrated by the sporocyst
life stage of the parasite, which asexually reproduces to form cercariae with pigment spots, ventral suckers, and tails formed of overlapping scales.
Interactions between the plasma proteins of Biomphalaria glabrata (Gastropoda) and the sporocyst
tegument of Schistosoma mansoni (Trematode).
The eggs hatch in water and go through a series of developmental stages in a snail (miracidium, sporocyst
, redia I, redia II, cercaria) and enter the gills, muscles or viscera of fresh-water crustaceans.
dendriticum hatch, pass through two sporocyst
stages of their lives, transform into another life stage called cercaria, and migrate to the respiratory chambers of the snails.
Table 1 provides a summary of the model parameters and environmental variables, together with their units, except four parameters associated with snail and sporocyst
development, discussed below, which do not appear explicitly in Figure 2.
Amaya-Huerta and Almeyda-Artigas (1994) proposed that the parasite was imported as sporocyst
or redial stages within the thiarid snall Melanoides tuberculata that was possibly introduced simultaneously with the black carp from China as a food for this malacophagous fish.