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 ?
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.
a) Translucent Stieda body (SB) and sporocyst residuum (SR); b) polar granule (PG) and oocyst wall (OW).
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).
However, other, related species of trematode within the family Monorchiidae (Subclass Digenea) use only one intermediate host: a single species of clam for both sporocyst and metacercarial life stages (DeMartini and Pratt 1964).
Loker and Bayne (1982) ascertained that the great majority of sporocysts incubated in the plasma of susceptible snails and later put into contact with amoebocytes originating from resistant snails were destroyed.
Also, the time delay between infection of the snail by a miracidia and the development of the sporocyst to a point where cercaria begin to be excreted is temperature dependent and represented by the delay time, [[tau].
Instead, experiments reveal the regular occurrence of predation by dominant species (with mouthed redial larval stages) on subordinate species and that certain species with only sporocyst larval stages (mouthless) are able to indirectly suppress the development of other subordinate species in a largely linear dominance hierarchy (Lie et al.
Sporocyst residuum present, consisting as numerous, coarse, homogenous granules 0.
59) La miracidium with one pair of flame cells (60) La saclike sporocyst stage ("mother sporocyst") in snail
Reproducing asexually, each sporocyst may yield as many as eight "rediae.