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The egg is found in the faeces, sputum, or urine of the definitive host. Depending on the species, it will either be non-embryonated (immature) or embryonated (ready to hatch). The eggs of all trematodes (except schistosomes) are operculated. Some eggs are eaten by the intermediate host (snail) or they are hatched in their habitat (water).
An egg-making organ, the vitelline gland, does not develop in females in the absence of a male. [16] Male gametes, spermatozoa, are present in the oviduct. [17] In males, there are rudimentary ovaries, oviduct, and oocytes (developing female gametes), [18] as well as vitelline cells. [19] Males also possess the genes for hermaphroditism in ...
The trematode Hirudinella ventricosa releases eggs in strings. Each egg contains a single miracidium, while the string contains living spermatozoa . Miracidia have cilia that are only present in the upper portion of the body near an apical gland with 12 hook-like spines in the opening.
Schistosoma is a genus of trematodes, commonly known as blood flukes.They are parasitic flatworms responsible for a highly significant group of infections in humans termed schistosomiasis, which is considered by the World Health Organization to be the second-most socioeconomically devastating parasitic disease (after malaria), infecting millions worldwide.
Sexual maturation is attained after 4–6 weeks of initial infection. A female generally lays 500–1,000 eggs in a day. [27] The female only leaves the male briefly for laying eggs. It has to because only it can enter the small and narrow peripheral venule in the submucosa so that the eggs can be released into the bladder.
Alaria is a genus of flatworms, or trematodes, in the family Diplostomidae. Alaria is a genus of small parasitic worm about 2–6 mm long and approximately 2 mm wide. It is usually found in the small intestine of dogs, cats, or wild carnivores. It is most commonly found in Europe, Asia, and the Americas.
Schistosoma japonicum is an important parasite and one of the major infectious agents of schistosomiasis.This parasite has a very wide host range, infecting at least 31 species of wild mammals, including nine carnivores, 16 rodents, one primate (human), two insectivores and three artiodactyls and therefore it can be considered a true zoonosis.
The eggs of some digeneans, for example, are (passively) eaten by snails (or, rarely, by an annelid worm), [2] in which they proceed to hatch. Alternatively, eggs may hatch in water to release an actively swimming, ciliated larva, the miracidium, which must locate and penetrate the body wall of the snail host.