22 Terms
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Parasitology
The study of parasites.
Industry: Biology
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Parasitology
cytostomal flagellum
Biology; Parasitology
In Chilomastix, a flagellum that lies in a grove behind the cytostome (usually within the cytopharynx) and directs solid food particles to the posterior end where food vacuoles are formed.
cytostome
Biology; Parasitology
In some protozoa, especially flagellates and ciliates, the cavity that opens by way of the peristome (the lips) to allow solid food particles to enter (the mouth). In some species, a food vacuole may ...
dead-end host
Biology; Parasitology
One in which the parasite reaches an end point and is unable to continue its life cycle (see aberrant host).
onchosphere
Biology; Parasitology
The stage that escapes from the egg shell and later from the embryophore of tapeworms. In human tapeworms it is a six-hooked (hexacanth) embryo.
oocyst
Biology; Parasitology
The stage of a coccidian protozoa that is evacuated with the feces. Sporocysts develop within the oocyst and, as the oocyst matures, sporozoites develop within sporocysts (except cryptosporidia where ...
operculum
Biology; Parasitology
Eggs of some trematode and cestode helminths have a cap-like structure at one end through which the embryo (larva) emerges. Protrusions surrounding the base of the operculum, called shoulders, are ...
opportunistic parasite
Biology; Parasitology
An organism that is not typically a parasite but may become parasitic under specific conditions. Amebae of the genus Neglaria are usually free-living but may become opportunistic parasites.
