Sporocyst


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Related to Sporocyst: Miracidium, Metacercariae, Miracidia, rediae

sporocyst

[′spȯr·ə‚sist]
(botany)
A unicellular resting body from which asexual spores arise.
(invertebrate zoology)
A resistant envelope containing an encysted sporozoan.
An encysted sporozoan.
The first reproductive form of a digenetic trematode in which rediae develop.

Sporocyst

 

(l) A stage in the development of some unicellular animals of the class Sporozoa, for example, coccidians and grega-rines. Embryos, or sporozoites, develop in sporocysts. In coccidians sporocysts develop as a result of division of the zygote into several mononuclear cells. The entire zygote in gregarines is converted into sporocyst.

(2) The first parthenogenetic generation in trematodes whose larvae are miracidia. In most trematodes the miracidia are transformed into sporocysts as soon as they penetrate the tissues of the intermediate host, a gastropod. A sporocyst is saccular or tubular in shape. In some species sporocysts have excretory organs, or protonephridia. The second parthenogenetic generation, the redia, usually develops from embryonic cells in the body cavity of the sporocyst. Only in a few species, for example, the lancet fluke, does another generation of sporocysts form from the embryonic cells.

References in periodicals archive ?
Cercariae are, however, more numerous than miracidia, as each sporocyst can produce thousands of cercariae per day.
Given the above, the objective of the present work was to document the unusual castration caused by sporocysts and to determine the prevalence and infection density of parasites in the gonads of the venerid clam M.
The morphologic characteristics of the oocyst, wall, sporocyst, sporozoite, and residual body were determined in micrometers.
After opening the mantle of the snails a large number of redia and cercaria and sporocyst larvae emerged outside the body of snails in Petri dish.
Sporocysts were ellipsoidal, 10.4 x 6.2 im (8-13 x 5-7), with a length: width ratio of 1.7 (1.3 - 2.2) and a small, translucent Stieda body.
Identification was based on the morphological features of the oocyst and sporocysts (size, shape and presence or absence of a micropyle or polar cap or oocyst residuum) under the 100 x objective, with the aid of taxonomic keys (Soulsby, 1968; Pellerdy, 1974; Levine, 1985; Coudert, 1992).
The oblique muscle fiber got damaged and mother sporocysts take place within foot muscles, thereby causing splitting, necrosis and increased empty spaces within muscle fibers (Figure 7a-7c).
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.
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.
Within the oocyst the zygote sporulates by dividing into two sporocysts. Each sporocyst contains four sporozoites.